A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

Orbital mechanics (also called astrodynamics) is the application of ballistics and celestial mechanics to the practical problems concerning the motion of rockets and other spacecraft on an orbital or …
Space Exploration Technologies Corporation, or SpaceX, is a private space exploration company. It was the world's first privately held company to successfully launch a cargo mission into space , cargo…
Questions about the science or exploration of the planet Mars. See the tag wiki for related tags.
1395 questions
Questions regarding the boosters or thrusters used to propel man-made objects. For rockets firing opposite the primaries, see [retrorockets]. See wiki for other related tags.
Questions regarding the takeoff or the liftoff phase of the flight of a rocket and the set of activities required for preparation of the launch vehicle leading to it.
1141 questions
Questions about the ISS (International Space Station), a habitable man-made low Earth orbit satellite whose first component was launched in 1998 and used to conduct experiments for a wide variety of r…
1048 questions
Questions about objects in orbit which are human made, such as communications and GPS satellites, orbital observatories and space stations, and other man-made object in permanent or semi-permanent orb…
Questions about Earth's Moon. Also for questions about spacecraft, manned missions, potential missions, etc. related to Earth's Moon.
844 questions
Questions pertaining to activities of the National Aeronautics and Space Administration, a United States government agency that deals with space exploration and research.
815 questions
NASA's Apollo program was a 17-mission program that focused on landing a human on the lunar surface. The program was the third human spaceflight by NASA, after Mercury and Gemini.
749 questions
Crewed spaceflight (also referred to as human spaceflight or manned spaceflight) is space travel with a crew aboard the spacecraft. When a spacecraft is crewed, it can be operated directly, as opposed…
686 questions
Questions regarding the Falcon launch vehicle developed by SpaceX for medium payloads (15,000 lbs) to LEO and GEO (via GTO, second stage cannot inject into GEO direct)
641 questions
Questions regarding the mechanics or attributes of objects falling 'around' other objects, thereby orbiting them.
621 questions
The Space Shuttle was a crewed, partially reusable low Earth orbital spacecraft operated by NASA from 1981 to 2011.
597 questions
Questions pertaining to the history of space exploration. Includes how current things will be viewed historically from the future (e.g. Apollo Moon landing sites 100 years from now)
588 questions
Systems for propelling a spacecraft from one place to another, such as rockets.
574 questions
Questions regarding the craft that house humans or equipment during space exploration.
567 questions
Questions regarding equipment used to propel a spacecraft or a rocket. Questions about attitude control jets should be tagged "attitude".
492 questions
Questions related to the movement of human-made objects as they enter atmosphere of Earth or other planetary bodies with atmospheres from space after being successfully launched.
Questions about rocket oxidizer, propellant, reactive mass, or other fuels used in spacecraft or rockets.
443 questions
Questions regarding the design or design process for a propulsion system.
408 questions
Questions regarding Low Earth Orbit or LEO, which refers to orbits at an altitude between approximately 160 kilometers / 100 miles and 2,000 kilometers / 1,200 miles.
407 questions
In spaceflight, an orbital maneuver is the use of propulsion systems to change the orbit of a spacecraft.
373 questions
Questions regarding the specific part of flights, during which a spacecraft touches down on the solid ground of a celestial body.
366 questions
Questions regarding information transfer between spacecraft, and between spacecraft and Earth.
365 questions
How physics applies to a particular activity in space or to getting to and from space.
343 questions
Questions about how space vehicles and related hardware are designed. See also [structural-design] and [engine-design].
342 questions
Questions regarding an envelope of gasses surrounding a celestial body held in place by the body's gravity.
325 questions
Questions regarding the attractive force present between two masses. If about research in artificial gravity (i.e. manmade substitutes for gravity), please use the artificial-gravity tag.
322 questions
The study of planets, asteroids, comets, etc, including weather, geology, composition, etc. This tag should be used when the focus of the question is on the the science of a non-Earth non-star natural…
320 questions
Questions regarding SpaceX's Starship, formerly the Big Falcon Rocket (BFR) upper stage or BFS
Questions which ask for an object in a photograph or other media to be identified and/or have its function described.
301 questions
Questions about alternative designs the asker has thought of, such as "why was X built this way and not this way"
293 questions
Questions regarding the path that a spacecraft will take due to forces acting on the spacecraft, such as gravitational or radiation from the sun.
288 questions
Mission design is the process of designing a space mission to fulfill a particular objective.
287 questions
Questions regarding people present on spacecraft or space stations.
284 questions
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