solar system Flashcards
0
Q
astronomical unit
A
A unit of distance equal to the average distance between Earth and the sun, about 150 million kilometers.
1
Q
solar system
A
The system consisting of the sun and the planets and other objects that revolve around it.
2
Q
planet
A
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
Q
dwarf planet
A
An object that orbits the sun and is spherical, but has not cleared the area of its orbit.
4
Q
asteroid
A
small, mostly rocky sattilite
