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20 Cards in this Set
- Front
- Back
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Sphere
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A round solid figure, most planets are shaped like this.
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Equinox
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The time or date when the sun crosses the celestial equator, when day and night are about equal.
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Waning Moon
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Having a smaller part of the visible surface of the moon illuminated by the sun.
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Maria
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A large, basalt plain on the surface of the moon.
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Rocket
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A cylindrical rocket propelled projectile that can go into space.
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Observatory
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A room or building that houses a telescope to study outer space.
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Orbit
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The curved path that a moon or planet takes around another planet or moon.
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Satellite
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An artificial or natural object orbiting Earth or another planet.
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Space Probe
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An unmanned spacecraft designed to transmit information about another planet's environment.
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Project Gemini
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Project Gemini was the second human spaceflight program of NASA
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Pluto
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A dwarf planet, ninth from the Sun.
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Comet
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An object made of ice and dust that orbits the Sun.
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Meteor
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A small body of matter that enters Earth's atmosphere.
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Meteorite
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A part of a meteor that strikes the ground.
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Asteroid
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A small rocky body orbiting the Sun.
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Jupiter
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The largest planet in the solar system and fifth in order from the sun.
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Mars
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A reddish planet that is fourth in order from the sun.
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Saturn
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Sixth in order from the sun, has many rings around it.
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Mercury
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A small planet in the solar system that is closest to the sun.
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Earth
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The planet on which we live on, the only planet known to have life.
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