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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.

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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.
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the application of ballistics and celestial mechanics to the practical problems concerning the motion of rockets and other spacecraft.
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Questions about the science or exploration of the planet Mars.
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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.
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Questions regarding the boosters or thrusters used to propel man-made objects.
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Questions about the 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 researc…
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human made, such as communications and GPS satellites, orbital observatories and space stations, and other man-made object in permanent or semi-permanent orb…
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Questions about Earth's Moon. Also for questions about spacecraft, manned missions, potential missions, etc. related to Earth's Moon.
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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)
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Questions pertaining to activities of the National Aeronautics and Space Administration, a United States government agency that deals with space exploration and research.
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Questions regarding the mechanics or attributes of objects falling 'around' other objects, thereby orbiting them.
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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…
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Questions regarding the craft that house humans or equipment during space exploration.
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Systems for propelling a spacecraft from one place to another, such as rockets.
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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.
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The Space Shuttle was a crewed, partially reusable low Earth orbital spacecraft operated by NASA from 1981 to 2011.
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Questions regarding the specific part of flights, during which a spacecraft touches down on the solid ground of a celestial body.
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Questions regarding Low Earth Orbit or LEO, which refers to orbits at an altitude between approximately 160 kilometers / 99 miles and 2,000 kilometers / 1,200 miles.
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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.
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Questions about rocket oxidizer, propellant, reactive mass, or other fuels used in spacecraft or rockets.
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Questions regarding information transfer between spacecraft, and between spacecraft and Earth.
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Questions pertaining to the history of space exploration.
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a scientific robotic spacecraft. It explores space and/or other planetary bodies (planets, satellites, asteroids, ..). It can flyby, orbit, enter atmosphere of, land on or submerge in…
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Questions regarding the design or design process for a propulsion system.
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the use of propulsion systems to change the orbit of a spacecraft.
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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.
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Questions regarding the formation of a new colony on another planet or other body.
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Questions regarding an envelope of gasses surrounding a celestial body held in place by the body's gravity.
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Questions about how space vehicles and related hardware are designed.
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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…
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propel a spacecraft or a rocket. Questions about attitude control jets should be tagged "attitude".
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Questions on ascertaining, predicting, and controlling spatial orientation and rotation of spacecraft, and on forces that affect spatial orientation.
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SpaceX's heavy lift launcher, based on the Falcon 9, using two strap-on boosters with a center core.
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Questions regarding the reuse of parts or equipment.
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Questions regarding the path that a spacecraft will take due to forces acting on the spacecraft, such as gravitational or radiation from the sun.
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Questions regarding people present on spacecraft or space stations.