Introduction to the Solar System - Savvas

Scientists use the ___ to measure distances within the solar system.

All but 2 planets in the solar system have a natural satellite or moon; ___ & ___

The sun is a(n)

The solar system began to form as ___ pulled rock, ice, and gas together.

The 4 outermost planets in the sun's orbit are mostly made of liquid and gas.

One day is the time it takes a planet to rotate on its

Planetesimals collided, stuck together, and eventually combined to form all the other objects in the

___, once the 9th planet in the solar system, is now considered a dwarf planet.

Scientists think the solar system formed about