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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.

An ephemeris provides a means for quickly estimating the positions, and sometimes orientations, of solar system bodies as a function of time.
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The burning process, especially of propellants, or as it otherwise relates to spacecraft or missions in space.
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Resultant reaction mass, usually a gas or plasma, released from a rocket or thruster, including chemical, cold gass, ion and other types of engines.
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The Hubble Space Telescope (HST) is a space telescope in low Earth orbit with a 2.4 meter main mirror capable of observing near ultraviolet, visible, and near infrared light. It was launched in 1990 …
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questions about how visible spacecraft are, as seen from Earth or anywhere else, as seen by eye or by imaging systems.
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Questions regarding acceleration - the rate and/or direction by which an object's speed or velocity vector changes with respect to time.
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Questions about the SpaceX produced Merlin-1D engine, used by the Falcon rocket.
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Questions regarding Apollo 13 which is launched as a part of American Apollo space program by Saturn v from Kennedy Space Center in April 11, 1970 carrying three crew members but lunar landing was abo…
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LOX (liquid oxygen) is pure oxygen kept at a temperature at which oxygen is a liquid, between approximately 54.4 K and 90.2 K (corresponding to -219 °C to -183 °C, or -362 °F to -297 °F). LOX can be u…
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In situ resource utilization aims to exploit materials found in the lithosphere and atmosphere of planetary bodies for life support, propulsion, and other functions of interplanetary missions.
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Questions regarding the type of orbit in which the orbiting object stays in roughly the same location over Earth's surface.
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Questions regarding torque generation and momentum storage by the means of rotating wheels
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Questions regarding exploration of the Pluto-Charon dwarf planetary system.
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Questions about equipment used to gather information during space exploration.
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Questions more about celestial bodies themselves than exploration of them.
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Questions on a place or enclosure in which humans and/or other lifeforms live.
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Refers to retrieving spacecraft or related equipment instead of simply expending it. Use with the related equipment tag(s) (i.e. [rockets]).
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Questions regarding model and/or high-powered rocketry.
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RTG is a Radio-isotope Thermo-electric Generator. It uses the heat generated by the decay of a radioactive material to generate power. Often the heat as well, to hold off the cold temperatures in sp…
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Questions about cosmic rays and cosmic background radiation.
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Questions related to the Cassini–Huygens spacecraft sent to Saturn.
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Questions relating to human physiology, as it affects capabilities in space.
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Questions concerning governmental regulation of activities in space and aerospace.
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Questions about space flight activities without humans onboard.
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Question regarding inflatable spheres filled with material lighter than the surrounding material used to lift objects, and their uses in space exploration.
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Questions relating to the ground based radio station used for receiving and or sending commands to spacecraft.
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Radio detection and ranging devices. Operate by detecting and processing return echoes from objects and surfaces of signals at radio frequencies. Can be used to ascertain spatial coordinates and veloc…
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Questions involving optical components, such as lenses, filters, and mirrors
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Questions regarding spacecraft, projects, or agencies of or relating to the United States of America.
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Ingenuity is the helicopter drone that flew to Mars on the Perseverance rover. Use for questions about the device itself. Use with the [perseverance] tag.
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A parachute is an object used to slow down objects. It's often found in either a round or rectangular shape. In regards to space travel it's often used to slow down capsules after re-entry allowing fo…
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Questions regarding the procedures in place to protect the area around a launch from damage in case of launch failure.
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Should be used for questions related to preventing collisions in orbit. This includes risk assesment, evasive manuevors, avoidance althorithims, and other safety measures.
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Questions regarding scientific procedures performed in space to test a hypothesis or make a discovery.
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Questions regarding small, clustered pieces of dirt/rock associated with the surface of a body, and its effect on space exploration. Use [tag:space-dust] for particulates in space.
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Questions about instruments to collect data from the environment.
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