13. Which planet has the "great red spot"?
A. Jupiter
B. Uranus
C. Mars
D. Neptune
14. Which of the planets take the longest time to complete its revolution
A. Mercury
B. Jupiter
C. Neptune
D. Venus
15. Which planet in the solar system has no moon?
A. Earth and Mars
C. Jupiter and Saturn
B. Uranus and Neptune
D. Venus and Mercury
16. Together, the sun and all of the bodies that revolve around it are called
A. the inner planets
B. the outer planets
C. the solar system
D. The galaxy
17. All of the following are inner planets except
A. Earth
B. Saturn
C. Mars
D. Venus
18. Why do planets remain in orbit around the sun?
A. due to the planets' size
B. due to the planets' density
C. due to gravity
D. due to the planets' features
19. Which planet has extreme temperatures because it has no atmosphere?
B. Mercury
C. Jupiter
D. Saturn
A. Earth
20. Which of the following is true?
A. Both the moon and sun orbit Earth.
B. The moon orbits Earth and Earth orbits the sun.
C. The sun orbits the moon and Earth orbits the sun.
D. The moon orbits the sun and Earth orbits the sun.​