What is the period of rotation for Mercury?

• 243 days 16 hours

• 88 days

• 23 hours 56 minutes

• 58 days 19 hours

Which planet rotates in the opposite direction compared to most planets?

• Venus

• Mercury

• Mars

• Earth

How long does it take for Earth to complete one rotation on its axis?

• 24 hours 40 minutes

• 23 hours 56 minutes

• 10 hours 42 minutes

• 9 hours 54 minutes

What is a notable feature of Mars' atmosphere?

• It is so thin that water would boil away quickly.

• It is rich in oxygen.

• It is similar to Earth's atmosphere.

• It is thick and dense.

Which planet has an axis almost parallel to the plane of its orbit?

• Jupiter

• Neptune

• Saturn

• Uranus