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16 Cards in this Set

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Telescope
A device people use to observe distant objects with their eyes
Satellite
An object that moves around another object in space
Revolution
The movement of Earth around the Sun
Orbit
The path that an object such as a planet takes as it revolves around another object
Star
A huge burning sphere of gases; for example, the Sun
Gas Giants
The planets Jupiter, Saturn, Uranus, and Neptune, which are large spheres made up mostly of gases
Axis
An imaginary line which runs through both poles of a planet
Phase
One of the different shapes the moon seems to have as it orbits around Earth
Planet
A large object that moves around a star
Rotation
The motion of a planet as it turns on its axis
Outer Planets
The planets farthest from the sun; Jupiter, Saturn, Uranus, Neptune and Pluto
Solar System
A group of objects in space that move around a central star
Asteroid
A small rocky object that moves around the sun
Comet
A small mass of dust and ice that orbits the sun in a long, oval shape path
Inner Planets
The planets closest to the sun; Mercury, Venus, Earth, and Mars
Space Probe
A space vehicle that carries cameras, instruments, and other research tools