National 5 Physics Space - Astronomical Definitions
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10 Terms
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Planet
A spherical natural body orbiting a star, big enough to clear its orbital path
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Dwarf Planet
A natural body orbiting a star, but not having cleared its orbital path
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Moon
Any natural satellite orbiting a planet
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Sun
The star in our solar system
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Asteroid
A rocky object, smaller than a dwarf planet
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Solar System
This consists of the sun, the planets and their moons, asteroids and comets
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Star
A large ball of gas where nuclear reactions produce heat and light
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Exoplanet
A planet orbiting any star other than the sun
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Galaxy
Millions of stars held together by gravity
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Universe
All the stars, dust, gas, all matter, all space and time. Everything
Note 
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