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Flashcards in Solar System Vocab Deck (7)
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Solar system

Solar system consists of the sun, the planets, their moons, and a variety of smaller objects.

1

Astronomical unit (AU)

One Astronomical unit equals the average distance between earth and the sun about 150,000,000 kilometers.

2

Planet

An object that orbits a star, is large enough to have become rounded by its own gravity, and has cleared the area of its orbit.

3

Dwarf planet

An object that orbits the sun and is spherical, but has not cleared the area of its orbit.

4

Asteroids

One of the rocky objects revolving around the sun that are too small and numerous to be considered planets.

5

Comets

A loose collection of ice and dust that orbits the sun, typically in a long, narrow orbit.

6

Planetesimal

One of the small asteroid-like bodies that formed the building blocks of the planets.