The Solar System

Small, rocky object that orbits the Sun in the asteroid belt between Mars and Jupiter.

• comet
• asteroid
• meteoroid
• star

Object made of gas, dust, and ice that moves around the Sun in an oval-shaped orbit.

• comet
• asteroid
• meteoroid
• star

Object in space made of gases in which nuclear fusion reactions occur that emit energy.

• comet
• asteroid
• meteoroid
• star

Average distance from Earth to the Sun---about 150 million km.

• kilometer
• period of revolution
• period of rotation
• astronomical unit

Time it takes an object to travel once around the Sun.

• period of revolution
• period of rotation
• astronomical unit
• greenhouse effect

Time it takes an object to complete one rotation.

• period of revolution
• period of rotation
• astronomical unit
• greenhouse effect

When a planet's atmosphere traps solar energy and causes the surface temperature to increase.

• trapped heat
• magic
• greenhouse effect
• this does not exist

Streak of light in Earth's atmosphere made by a glowing meteoroid

• meteor
• meteorite
• meteoroid
• impact crater

Meteoroid that strikes a planet or moon.

• meteor
• meteorite
• meteoroid
• impact crater

Small, rocky particle that moves through space.

• meteor
• meteorite
• meteoroid
• impact crater