Introduction To The Solar System

Question 0

Astronomical Unit

Answer 0

A unit of distance equal to the average distance between Earth and the sun, about 150 million kilometers

Question 1

Solar system

Answer 1

The system consisting of the sun and the planets and other objects that revolve around it

Question 2

Planet

Answer 2

Must be round, orbit the sun, and have cleared out the region of the solar system along its orbit (this means it does not share the area of its orbit with any other objects)

Question 3

Dwarf planet

Answer 3

An object that orbits the sun and is spherical, but has not cleared the area of its orbit (this means that other object share its orbit)

Question 4

Asteroid

Answer 4

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

Question 5

Comet

Answer 5

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

Question 6

Planetesimal

Answer 6

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