A Family of Planets

We call the inner planets this because they are rocky, like Earth!

• Terrestrial
• Rocky
• Gas Giants
• life

How do we typically measure distances within the solar system?

• light-years
• parsec
• kilometer
• astronomical unit

Why do active planets show fewer impacts than places like the moon, other than having atmospheres?

• fewer orbiting objects near the planet
• most impacts occur in oceans
• erosion removes evidence of impacts
• geological activity removes their effects

How do gas giants differ from terrestrial planets

• they are smaller
• they are made of rocks and ice
• their atmospheres are massive
• they have hard surfaces

What is the current theory about the origin of the moon?

• It was a large asteroid captured by Earth's gravity
• The moon formed at the same time from the same material
• A large body struck earth, launching material that formed into the moon later into its gravitational field in space
• the moon spun off of a rapidly spinning earth

What gives us evidence that Mars had liquid water at one time

• Martian icecaps
• fossils of sea life found during missions
• the color of martian sand
• features that resemble dry riverbeds

Planet known for its ring system

• neptune
• jupiter
• earth
• saturn

largest planet in the solar system

• pluto
• venus
• saturn
• jupiter

Planet has a year that is 88 Earth Days long

• uranus
• mercury
• venus
• earth

The Great Dark Spot belongs to this planet

• Jupiter
• Neptune
• Uranus
• Saturn