About the KSA


The Kerbal Space Agency is a project dedicated to realism both in how things are played in Kerbal Space Program and how things are presented to you, the audience.

Realistic Playstyle

The “real world” here is Kerbin, not Earth, and reality applies to the kerbal world as opposed to how things behave in the Earth world. For example, re-entry into Earth’s larger atmosphere provides a significantly greater challenge relative to re-entry in Kerbin’s smaller atmosphere, and the physics of the game are not changed to make Kerbin more like Earth. Kerbin is Kerbin. It’s also proper for all bodies in the universe to affect each other via gravity, but KSP uses only a 2-body physics simulation. Although it’s possible to modify the game for an n-body simulation, reality will remain a 2-body simulation.

That said, we do allow some elements of actual reality to affect the gameplay. Some examples include: the speed of light is properly calculated when determining signal delay between vessels; Kerbals that die stay dead, and kerbals that survive horrific crashes end up injured; Some rocket engines may only have a limited number of restarts; Cryogenic fuel boils off; Radiation is a serious concern; Life support is required for crewed missions; Rockets take time to build, roll out, launch and be recovered; Technology is gained and applied gradually over time.

Realistic Presentation

All the actions and events that occur throughout the KSA’s history are presented to you as if they are actually happening at any given time (see the FAQ for more on the use of Earth time). Largely through this website, @KSA_MissionCtrl and the Flight Tracker/Crew Roster, you are able to immerse yourself in the regular operations of the Agency and keep track of what is happening. These operations are all supported by numerous materials including vessel blueprints, surface maps, visualizations, info-graphics, telemetry data, on-board camera images, videos and more, dispersed through our various media channels (see icons at top of page)

While other players prefer to use YouTube or livestreams on Twitch or convert their missions to stories or graphic novels, the KSA is presented in the style of actual space agencies like NASA, ESA, CSA, JAXA, etc. While it’s possible to see much of their operations in person, the majority of people see only what is shown via the agency’s various media outlets, as it is with the KSA. Such operations will be carried out following much of the same procedures and guidelines put in place by actual agencies. You may very well forget that this is all happening in a game.



A Brief History of Kerbin & Kerbal Society

Sea Ring Crater

Sea Ring crater, site of the asteroid impact

years ago (1746 AD Earth time) Kerbin was populated across the world by both primitive and advanced societies, some of which were at various states of war with one another. While combustion engines and propellers powered various forms of transportation (dirigibles, boats, cars), jet turbines, fixed-wing aircraft and atomic power had yet to be fully realized by any society and no one had any want or need to travel into space when so much of Kerbin lay unexplored. Most societies did not even bother studying the vast universe above them. This all led to no one having any clue a roughly 7km-wide asteroid was bearing down on the planet. It sliced through the thin atmosphere and slammed into the edge of a continent, forming a crater about 175km in diameter and bringing about the onset of a global extinction.

The more advanced societies that survived the initial impact were able to band together and begin frantically tunneling underground to survive the coming nuclear winter and toxic atmosphere created by all the volcanic eruptions triggered after the impact. Anyone and anything left on the surface was dead within 20 years, leaving behind only the hardiest of bacteria and other basic life forms. For just over 200 years kerbals survived underground with all they could collect and preserve from the surface stored in genetic vaults. The fact that kerbal society in any form was able to survive at all was due largely to the ingenious work of the scientist Joonhuff Kerman, whose surname is now adopted by all adult kerbals as a sign of unity.

The ability to live on the surface returned years ago (1971 AD Earth time), and although every one of the descendants of the original underground colonists relish the ability to walk out under the sun and through the vast wilderness that has regrown since the impact, a deeply-ingrained fear of the sky above keeps the majority of society below ground even to this day. However it also bolstered a desire to know more about what happens above the surface of Kerbin, and whether another space rock is on its way at some point. The fields of astronomy, astrophysics and cosmology have grown by leaps and bounds over the last several generations from observatories built into mountains and as the vastness of the universe opened up, kerbal society grew even more tightly knit.

A History of the Kerbal Space Agency

years ago (2014 AD Earth time) came the discovery of The Monolith, which spurred the entire kerbal population to seek out life among the stars. An entrepreneurial kerbal by the name of Drew Kerman began gathering up the brightest minds in various fields related to rocketry and spaceflight in order to form an agency with the mandate of exploring and observing the space around and beyond Kerbin. It was not until late 2016 that everything was in place to officially form the Kerbal Space Agency. Surprisingly, the most difficult part was the surface facilities that would need to be constructed to house the space program – no one had built structures on the surface for so long it was almost a lost art. With the end of construction for the Kerbal Space Center, the KSA began operations to formulate and carry out its strategy for conquering the void above and beyond while the rest of kerbal society began to repopulate the surface in support.

Simultaneous to the onset of KSA operations came along the Asteroid Tracking Network, as technology behind telescopes was finally getting to the point of being able to detect small rocky bodies like the one that had nearly wiped kerbal civilization out of existence. Although some notice of large asteroids had been declared in years past, they were simply fortuitous discoveries and no one had been able to dedicate resources to either properly document their orbits or go looking for smaller rocks that didn’t reflect much light. The ATN has spread the workload out among several telescopes operated by educational institutions and the Kerbal Astronomical Society but relies largely on amateur astronomers, more and more of whom are making trips to the surface with personal scopes that can spot asteroids as the technology becomes more widespread and cheaper.

Latest summaries of events transpiring at the Kerbal Space Agency:


The Monolith

Over the years since the surface became habitable once again adventurous kerbals have set forth from the underground caverns to explore the new surface world. No one was expecting to find an unnatural object on the surface of Kerbin after more than 200 years following a global cataclysm and yet one of the explorers stumbled across this mysterious artifact on the shores of the Kerblantic ocean.

The monolith appears to be embedded deep into the ground, as all attempts to move it have failed and trying to excavate it produced an unsettling tremble deep in the body of kerbals in the area. This prompted further study into the object’s apparent ability to sense its surroundings, but no further reaction could be elicited. Other than the fact that it did not want to be moved, the monolith gave up no further clues as to its purpose.

Although the object remains an enigma, the population of Kerbin have little doubt that it was placed there by some form of advance intelligence in the centuries since the asteroid impact. The object and what it could mean for other life in the galaxy has spurred the kerbal society to begin their own journey to the stars. The location of the object was deemed to not be a coincidence, situated at a perfect spot from which to launch rockets into orbit. A facility for doing that and more was constructed on the same land.

Various studies of the monolith remain ongoing at the nearby KSC, and any updates from them can be reviewed below.


KSC Information

The Kerbal Space Center, the first surface complex to be built in over 200 years, houses facilities for the research, development, management, construction, control and launch of rockets and aircraft for the purposes of exploring both the surface of Kerbin and space beyond the atmosphere. Employees are also housed within the space center and its satellite community buildings, which provide additional support for surface operations. A single access road provides a link to the nearest underground city. Public access to the KSC is currently restricted while focus remains on getting the various programs off the ground and operating efficiently.

[1] Research & Development

The KSC has several buildings dedicated to testing new technologies and evaluating data returned from missions. Scientists at work here are among the best on the planet at what they do, covering disciplines from biology to astronomy to meteorology and more. The R&D department’s focus and overall mandate is lead by the enigmatic Wernher Von Kerman, although the day-to-day operations are overseen by the energetic Lead Scientist Cheranne Kerman.

[2] Tracking Station

Engineers coordinate & monitor any active mission vessels from this building, as well as maintain communications using the two dishes available. These 6m diameter dishes can receive hi-gain signals easily from Kerbin orbit and clear out to Minmus. Beyond the Kerbin system these dishes can only collect enough radio waves to support lo-gain signal reception.

[3] Launch Control

Set well back from the launch pad (which does sport a nearby bunker for any adventurous kerbs and sensitive science equipment) sits the launch control building, domain of Flight Director Lanalye Kerman and her team. All vehicles launched from the KSC are controlled from here during their roll-out, pre-flight, launch and initial ascent before being handed over to the tracking station.

[4] Administration Complex

These buildings house the majority of KSA staff as well as the current crop of astronauts and largely handle the day-to-day operations of the KSC. They include the offices of Operations Director Drew Kerman and Head of Finances Mortimer Kerman.

[5] Vertical Assembly Building

Standing an impressive 67m, this is currently the tallest known unnatural structure on the entire surface of Kerbin and can handle the construction of vehicles as tall as 50m and as wide as 22m in diameter. We hear the views from the top are pretty awesome.

[6] Horizontal Assembly Building

This second construction facility, currently designed for aircraft, is able to support vehicles only as high as 7m but with a length of 58m and a width of 40m (although vehicles wider than 17.5m will need their wings removed to make it through the doors). Both this and the VAB are managed by Lead Engineer Simon Kerman. The HAB is also run in conjunction with C7 Aerospace, which is focused on the development of fixed-wing flight and jet turbine technology.

[7] Support Village

To help support operations on the surface, supplies and additional personnel are housed slightly off-site in the nearby support village, which is connected to the nearest underground city via road. It also provides a security checkpoint for access to the KSC.


KSA Staff

Drew Kerman – Operations Director

The study of space was already in full swing by the time Drew was born, and he grew up fascinated by the heavens. He originally sought a career in astronomy but was unfortunately the scion of a wealthy business conglomerate who was forced to take over the reins of his parent’s corporation when their airship crashed during a business trip. However with the discovery of The Monolith and the accompanying rapid shift in kerbal culture he was able to convince his Board that investing in a space agency would open up all kinds of new business frontiers and provide a gateway back to the surface before reaching for the skies above. He has since sold his shares in his parent’s corporation and has invested his own personal wealth into the Kerbal Space Agency.

Lanalye Kerman – Flight Director

As a former Lead Policymaker for the Air Safety Administration, Lanalye has a unique set of talents geared towards the management of vessels and procedures for their safe operation. She heard about the formation of the KSA and immediately put forth her bid to handle all operations pertaining to craft developed and deployed by the company. Although initially daunted by the task of handling so many unknown issues pertaining to fixed-wing flight and spacecraft she has nonetheless put into place measures and standards she feels all staff should follow to help ensure that operations around the KSC are handled with the utmost efficiency and safety. She exudes a calming confidence and is the voice all crew look forward to hearing over their headsets.

Simon Kerman – Lead Engineer

Technically he’s an executive member of the KSA but should you ever find him in a suit and tie it would probably mean he’s being made ready for display at his funeral service. He also has an office, but you won’t find him there either. If you’re looking for Simon, check the VAB or HAB – you may have to call him out from inside a huge mechanical construct as well. A gearhead since youth, Simon left his former high-paying job as an airship engineer to join the KSA. Initially Drew tried to impress upon him the exciting new technology and research he would be able to partake in while helping to further kebalkind and turn his people into a true space-faring race. But he didn’t actually sign up until Drew got to the part where he wouldn’t have to wear a suit and be stuck in an office.

Wernher Von Kerman – Head of R&D

Billed as one of the “great scientists and researchers of our time” (the news article hangs on his wall), Wernher ensures that everyone around him is aware of it. He was first recognized during a kerbling science fair when he produced a chemical reaction that neutralized acidic bacterial excrement in ground water. Since then he has gone on to produce advancements of some form or another, large and small, in almost every scientific field known to kerbalkind. The breadth of his experience is staggering and suits him well in managing all the research carried out by the KSA. Although his haughty demeanor can be a burden to most, no one can deny that when he’s right, he’s right. Getting him to admit he’s wrong however – well that’s a battle few ever bother to attempt to win.

Cheranne Kerman – Lead Scientist

An academic through and through, Cheranne was head researcher for a major university before being offered to work at the KSA. She’s dreamed of living and working on the surface her entire life, and her energetic demeanor lends itself well to the outdoors, where she prefers to spend the majority of her time away on research trips. However there’s no escaping the responsibilities of her station and although she loathes time spent in the office managing the crop of researchers for Wernher you won’t hear any complaints from the scientists when she’s around. In addition to managing the scientists she also leads the peer review of all papers sent out for publishing from the KSA

Mortimer Kerman – Head of Finances

Ensuring that the KSA has the money to continue operating falls to one kerb… and his team of accountants. Balancing the books for a large company like the KSA isn’t much of a burden for a long-time financier such as Mortimer but he does admit the unique task of juggling so many contracts and strategies provides him a challenge he’s not seen in any market to date. Although getting on in his years, his mind is sharp and his wit is snappy. Even so, he fears he will never completely get used to the nature of experimental rocketry, where an investment can literally go up in smoke (and a few thousand tiny pieces).

Character art by Yorshee


#1 Why do you use Earth time (days/months/years)?

There’s no real point in making people have to learn a different time system when they are trying to follow along with ongoing operations. Being able to split events into days/weeks/month/years that people already comprehend just makes everything easier to follow. A lot of what we do can be followed online via our Flight Tracker, where you can watch launches, maneuvers and see the craft move, so it’s important that people have a good understanding of when things are happening if they want to watch. There are numerous in-jokes made about the kerbals using a system of time that has no relation to their planet. Hey how do they even speak English?

#2 What about leap years?

They simply do not exist, and every 4 years the in-game date conversion will need to be offset by one day as the game always counts 365 days for one year. To the audience, Feb 29th simply won’t have any updates, and when the account says “tomorrow” on Feb 28th it means March 1st.

#3 What about leap seconds?

If the KSA is actually around long enough to care about leap seconds, we still won’t really care about them.

#4 How does the Flight Tracker work?

A common misconception about the Flight Tracker is that it’s pulling data from an always-running copy of KSP similar to how web-based telemetry mods like Telemachus operate. The Flight Tracker however is not a real-time system, it’s just simulating a real-time system. Data for vessels and bodies are stored in states that are stamped with a specific time they are valid in seconds since the start of the game. When you view the Flight Tracker it pulls up the previous state of the vessel/body nearest to the current time you are viewing and extrapolates any data it needs from that point on. This is similar to how the game actually works – if you view your SFS save file you will see the last state your vessels were in and when you load the game it uses those values to calculate where in orbit the vessel should be for the current point in time and how it should travel from there.

The actual technology behind the Flight Tracker and Crew Roster is a rather horrible mash of Javascript and ASP tied to MsAccess databases (see the Github repository for details). It’s not pretty, but the author was never really a web developer, and it all seems to work okay.

#5 Is the game actually played in real time?

No. Events are fed to you, the audience, in real time but the game itself takes full advantage of time warp wherever possible. If 4 in-game days pass in the span of a real day, then it will be 4 real days before those events are made fully available to the audience. In fact a lead time of 1-3 months is generally in place so the author can take time off if needed without having to interrupt any ongoing KSA events. Usually.

#6 What type of game mode is KSP played in?

Career mode is used, however it is modified to allow the KSA to develop in its own way rather than strictly by how the game decides career saves should progress.

#7 What mods are used by the KSA?

You can find the full listing of mods in use and various notes about their use in our Mod Installation Log.

#8 Why is the sun yellow in space and not white?

We see a white sun in space because of how hot it is, and a yellow sun from Earth due to scattering in the atmosphere. Kerbol (known in the game as The Sun but we prefer Kerbol) is smaller and cooler, so it appears yellow from space. It should probably appear a slightly different color when viewed from Kerbin but due to game engine limitations that’s not possible for now.

#9 Is there actual weather in the game?

Sadly, no. Several attempts have been made by modders to introduce weather but none have been completed. However consideration is given to what the weather could or should be like, and is simulated as best as possible with what options are available. For example rainy days don’t actually cause rain to happen in the game, but anything that would be affected by the rain like aircraft simply don’t fly missions. Weather is mentioned a lot in our tweets because it brings about more variation in missions, but any wind/rain/etc is not affecting anything in the game itself (although missions are still played as if they are as best as possible). Foggy or overcast days are done by changing the altitude/density of the clouds, and cloud altitudes can be changed to be low or high depending on what the plot requires to keep things interesting. There is one instance of actual game weather – the clouds do move while the game is running, so sky conditions change dynamically. This is sometimes used to determine if/when missions that rely on clear skies are launched or not. Other times it is a plot decision.

#10 How many people work on this project?

Just one. He has no life. However a lot of what is used by the KSA in all aspects are also assisted by the KSP community in general in the form of ideas, mods, code libraries, graphics, etc.

#11 Will the KSA ever share universe with other twitter accounts?

No. Maintaining a shared universe across more than one hobbyist project generally is not a good idea, and too much extra work would need to go into planning to keep things working together. It’s been tried to various extents in the past, so this is not just a belief but a proven fact. You can still follow other interesting KSP space agencies on twitter.

#12 Will the KSA explore the entire solar system and colonize most of it?

Eventually, yes.

#13 How long will this take?

Years. Real-world years. Hopefully the KSP community will still be around, but if not hopefully everyone who has stopped playing or just burned out from playing will still enjoy following along.

#14 Why is it taking so long to get to space (kerbed missions, stations, other planets, etc)?

Because space is hard? But really though, it is, and part of the aim for this project is to reflect that, and also reflect the effort that real-world space agencies put in, through the billions of hours worked by their thousands of employees. When I finally send a probe to another planet after a few actual years, I hope to feel just a small slice of what actual spacecraft mission participants have had to endure to get their missions to their destinations (and I don’t just mean travel time – did you know New Horizons took over a decade of work just to get to the launch pad?). There is also the fact that KSP is still a very actively-developed game both from the actual game makers and the modding community, which means the longer it takes for KSA to do something the better it will look. Finally, taking everything slow lets me, the sole project owner, actually handle it all without getting overwhelmed as more and more operations begin to take place over time.

#15 Could you burn out?

That’s very possible, hopefully it won’t happen. But if it does, it probably won’t be anyone’s fault but my own for working too hard

#16 Will the KSA visit other star systems?

Eventually, yes. That will take even longer – although the advent of some form of FTL technology will likely come about to help.

#17 What can I do to support the KSA?

Be active and responsive – I love interacting with people on twitter. Comments and feedback can also be submitted here on the website as well as stuff posted on reddit and the KSP forums. Seeing people take interest and participate is very rewarding.



Here is a glossary of acronyms, abbreviations, symbols and terms that are used by the Kerbal Space Agency. When you see [] anything within them is optionally included, with numerous options separated by /. * is a wildcard character that can be replaced by any letter and # is a wildcard character that can be replaced by any number. Anything in () refers to an alternate way of writing the term.


Show Terms

Ω (LAN)Longitude of Ascending Node, an important orbital parameter that allows for launching beneath the orbit of an inclined target to aid in rendezvous

Δv (Dv)Delta-v, the amount of change in velocity the vessel is capable of performing

ANAscending Node, the point at which a vessel’s inclined orbit rises above the body’s equator

AOAAngle of Attack, the angle between the chord of an airfoil and the direction of the surrounding undisturbed flow of gas or liquid.

AOSAcquisition of Signal, in reference to the receipt of radio telemetry from one vessel to another or to a ground station

ApApoapsis, the highest point of a vessel’s orbit. This term can also refer to a specific body. For example instead of saying “apoapsis around Kerbin” the term “apokee” can be used. Full list of Apo/Peri terms

Appulse – the closest apparent distance between two celestial bodies, as seen from a third

ASAAir Safety Administration, governing body responsible for all aircraft training, flight and assembly regulations for both dirigibles and fixed-wing craft

Assembly, The – a group of elected kerbals responsible for debating law and procedure for the kerbal world government


ATNAsteroid Tracking Network, a collaboration of observatories and amateur astronomers across Kerbin that allot time to searching and cataloging asteroids

Biome – a region of a body’s surface with characteristics different from that of other adjacent regions

BECO[-#]Booster Engine Cut-Off, some or all of the current engine(s) powering attached boosters are no longer operating. If there are additional boosters to fire or still firing, the acronym can be appended with a number. For example BECO-1 could cut off 2 of 4 boosters followed by BECO-2 to cut off the two still remaining

C7C7 Aerospace, a company specializing in fixed-wing aircraft that operates jointly with the KSA at KSC out of the HAB

CapComCapsule Communications, the station at mission control responsible for radio link and monitoring of a crewed vessel

CdrCommander, a rank signifying pilot capabilities in atmosphere and orbit and leadership capabilities (seniority)

Class-A (A) – an asteroid class ranging from 2.1 ~ 9.5 tons in mass

Class-B (B) – an asteroid class ranging from 9.5 ~ 42.5 tons in mass

Class-C (C) – an asteroid class ranging from 42.5 ~ 190.6 tons in mass

Class-D (D) – an asteroid class ranging from 190.6 ~ 854 tons tons in mass

Class-E (E) – an asteroid class ranging from 854 ~ 3,828 tons in mass

CO2Carbon Dioxide

ComSat (CS)Communications Satellite, a vessel designed to relay radio signals

CptCaptain, a rank signifying pilot capabilities in atmosphere and orbit


Show Terms

DNDescending Node, the point at which a vessel’s inclined orbit falls below the body’s equator

D/ODe-Orbit, an object has either been dragged down from an orbital velocity or maneuvered onto a sub-orbital path

ECElectric Charge, a measurement of the power being used or stored by a vessel or part of a vessel

EccEccentricity, the shape of a vessel’s orbit. The closer to 0 the more circular, the closer to 1 the more oval-shaped. Values beyond 1 refer to an orbit that escapes the current SOI

EVAExtra-Vehicular Activity, operations performed by astronauts outside of a vessel

FDFlight Director, the station at Mission Control responsible for any upcoming and ongoing operations of vessels


FOFlight Officer, a rank signifying pilot capabilities in atmosphere only

FTSFlight Termination System, a radio-controlled system that detonates a small explosive package embedded in the rocket in order to render it harmless should it fly out of the defined launch corridor or otherwise appear to be out of control


H[*]OHigh Orbit, an orbit well above the atmosphere of a body. The point at which this area of space begins after Low Orbit varies from body to body. Can include a letter to specify the body, such as HKO for Kerbin and HMO for Mun/Minmus/Moho (context matters)

HABHorizontal Assembly Building, facility for constructing vessels meant to be launched from the runway

HGTHigh Gain Telemetry, data signals are received in large packet sizes allowing for data to be received faster

IMIntercept Maneuver, the use of engines or thrusters to set a vessel on course to rendezvous with another vessel

IncInclination, the angle at which the orbit is tilted relative to the equator of the body it is orbiting


KASKerbal Astronomical Society, the scientific body governing space research and observation

Kadet – an astronaut trainee

Kerb – an individual kerbal. It is not a gender specific term but is mostly used to refer to male kerbals of any age

Kerbette – an individual female kerbal, of any age

Kerblet – an individual infant kerbal, not a gender specific term

Kerbling – an individual child kerbal, not a gender specific term

KMSKerbal Meteorological Society, the scientific body governing atmospheric research and observation

KNNKerbal News Network, the only world-wide news agency on Kerbin

KSAKerbal Space Agency

KSCKerbal Space Center, also sometimes referred to as the Kerbal Space Complex, the base of operations for the KSA

KUKerbin Unit, the distance from Kerbin to the sun – 13,599,840,256 m

L minus (L-) – the actual time remaining until launch. does not take into account built-in holds

LDLaunch Director, the station at Mission Control responsible for readying and launching a vessel. Can be run by the Flight Director

LESLaunch Escape System, a means by which the crew capsule is separated from the main vessel for recovery in the event of a failure on launch or ascent

LFLiquid Fuel, a propellant used in rocket engines

LFOLiquid Fuel/Oxidizer, a mixture of propellants that are used to ignite and burn rocket engines. They have similar densities and are burned equally so they can at times be referred to as one unit

LGTLow Gain Telemetry, data signals are received in small packet sizes causing large data transmissions to take longer to receive

L[*]OLow Orbit, an orbit near to the body’s atmosphere. The range from the atmosphere top to High Orbit varies from body to body. Can include a letter to specify the body, such as LKO for Kerbin and LMO for Mun/Minmus/Moho (context matters)

LOSLoss of Signal, can also in some contexts mean Line of Sight

LZLanding Zone


Show Terms

M minus (M-) – the time remaining until the next maneuver

MaxQ – the point during atmospheric ascent where the greatest aerodynamic pressures exist upon the vessel

MECO[-#]Main Engine Cut-Off, the current engine(s) powering the vessel are no longer operating. If the same or future engine(s) are meant to be used at a later time, a number can accompany the acronym, for example MECO-1 would be followed by another burn leading to MECO-2

MCMission Control

MCUMain Control Unit, a reference to the part of the probe that handles all operations for the vessel

MDMunar Distance, the distance from Kerbin to Mun – 12,000,000 m

METMission Elapsed Time, the amount of time that has occurred since the mission began, which could be from launch or from separation from another vessel

Mit – a single unit of scientific data


MPMonopropellant, a propellant used in RCS

MSVMaritime Service Vessel, used to identify a boat

NETNo Earlier Than

NKONear-Kerbin Object, an asteroid that passes through Kerbin’s SOI

NVNight Vision




[*]OI[B] Orbital Insertion [Burn], the maneuver that places a vessel into a stable orbit around a body. Can be prepended with a letter to specify the body, such as KOI for Kerbin or MOI for Mun/Minmus/Moho (context matters). The use of “B” is generally reserved for vessels entering orbit after an ascent

OTOver Time, not something we take lightly at the KSA however situations can demand it and our staff/crew are so enthusiastic sometimes its hard to deny it

OXOxidizer, a propellant used in rocket engines

PePeriapsis, the lowest point in a vessel’s orbit. This term can also refer to a specific body. For example instead of saying “periapsis around Kerbin” the term “perikee” can be used. Full list of Apo/Peri terms

PICPilot In Command, the Flight Officer, Captain or Commander currently responsible for control of a crewed vessel

Presider, The – head political kerbal in charge of the planet’s world government, elected into 4 year terms

RCSReaction Control System, thrusters powered by small engines or solid propellant that are used to stabilize and steer a vessel

RFRadio Frequency, the type of transmissions used by remote vessels to communicate with mission control or each other

RSORange Safety Officer, the station at Mission Control responsible for safety around the launchpad and below the ascent corridor

RTGRadioisotope Thermoelectric Generator, a long-lasting power source that uses heat from a decaying radioactive element to provide electrical charge

RVRendezvous, two objects approaching to within close proximity

RVMRendezvous Maneuver, the use of engines or thrusters to match velocity with a target object and begin approach phase



Show Terms

SARSearch and Rescue

SASStability Assist System, a computer-controlled guidance system that uses control surfaces, reaction wheels and RCS to set and maintain a vessel’s orientation without the need for manual pilot input, although it can also take manual input and stabilize/dampen it

SECO[-#]Second Engine Cut-Off, if a launch vehicle carries a 2nd main stage to orbit, this is referred to as the second engine. If the engine is meant to re-light in the future for another burn, the first cut-off is referred to as SECO-1 and the second SECO-2 and so on

[*]SOSynchronous Orbit, an orbit that allows the vessel to maintain position over the same point on the surface of a body. Can be abbreviated with a letter to denote the specific body, such as KSO for Kerbin or LSO for Laythe. Not all bodies can be orbited in this manner

SOISphere of Influence, the sphere in which a body’s gravity affects a vessel’s orbit. A vessel is only ever in one SOI at a time

[E/S]SpcSpecialist, a rank signifying both a science officer or engineer, unless specified with an E or S

SRBSolid Rocket Booster, a type of engine that burns solid fuel and is typically used to escape the dense lower atmosphere

T minus (T-) – the time remaining to launch in the terminal count that is run by the launch computer, which has built-in holds

TDUTelemetry Data Unit, a device that collects input from various craft sensors and stores the data for later access by engineers to get a closer look at what went on during a flight. Can also beam data down to the ground if sophisticated enough and supplied with enough power

T[*]ITransfer Injection, a maneuver meant to set a vessel on course to transfer to another body’s SOI. Adding a letter can specify the destination. TMI could mean Trans-Munar Injection or Trans-Minmus Injection, depending on context. Other examples are TDI (Trans-Duna Injection), TKI (Trans-Kerbin Injection), etc.

TlmTelemetry, data returned from the vessel, either in a data storage unit or through a radio signal

TSTracking Station

TWRThrust-to-Weight Ratio, a value that indicates a vessel’s ability to accelerate. The higher the TWR the faster a rocket will gain speed. A TWR of less than 1 will not be able to overcome the surface gravity on Kerbin

USIUmbra Space Industries

UTCUniversal Time Coordinated, the time at the Prime Meridian of Earth, used to allow KSA followers to calculate their own local times if they wish

UTVUtility Task Vehicle, an off-road 4×4 capable of transporting equipment and crew overland

VABVertical Assembly Building, also known as the Vehicle Assembly Building, a facility where vessels meant to launch from the pad are constructed

WHWaste Heat, thermal heat accumulated by operating solar panels thanks to solar radiation



ZZulu, another shorter way to say UTC. This is not as well known, so is used very sparingly