Planetary Review

How is Earth different from all the other planets?

• A It rotates on its axis.

• B It has a breathable atmosphere.

• C It has a rocky surface.

• D It is warmed by the sun.

Which planet is a gas giant?

• A Mars

• B Venus

• C Saturn

• D Earth

A gas giant planet is not made of solid matter. A terrestrial planet is made of —

• A metals and moons

• B rocks and metals

• C moons and rocks

• D gases and heat

How many planets are in our solar system?

• 6

• 7

• 8

• 9

Name the planets in order from the sun.

• Mercury, Venus, Mars, Neptune, Uranus, Saturn, Earth, Jupiter

• Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

What is the center of the solar system?

• A Jupiter

• B Sun

• C Earth

• D Mars

What do Mercury, Venus, Earth, and Mars all have in common?

• A They are all very cold planets.

• B They are considered terrestrial planets.

• C They are about the same size.

• D They are considered gas giants

What is the smallest terrestrial planet?

• A Neptune

• B Mars

• C Mercury

• D Earth

How many planets are gas giants?

• 3

• 4

• 5

• 6

How many planets do scientists consider to be in our current solar system?

• 8

• 6

• 7

• 9