Absolute zero, The lowest temperature that is theoretically possible., Black hole, A region where gravity is so strong that nothing, including light, can escape., Crater, A hollow on the surface of a planet or moon., Diameter, A line through the centre of a circle from one side to the other., Eclipse, An event in which one space object moves into the shadow of another., Equator, An imaginary line around the middle of a planet, moon or star., Extraterrestrial, Coming from somewhere beyond Earth., Gas giant, A very large planet made mainly of gas., Heliosphere, The vast region influenced by the Sun’s solar wind and magnetic field., Light year, The distance light travels in one year., Meteorite, A space rock that reaches the surface of a planet., Orbit, The curved path an object follows around a star or planet., Radiation, Energy that travels in rays or waves., Spacewalk, Time an astronaut spends outside a spacecraft while in space., Zero gravity, A condition in which gravity does not appear to act on a body.

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