1. The two factors that combine to keep the planets in orbit are
gravity and orbital speed.
orbital speed and mass.
mass and inertia.
gravity and inertia.

2. The two factors that combine to keep the planets in orbit are
gravity and orbital speed.
orbital speed and mass.
mass and inertia.
gravity and inertia.

3. What do all of the inner planets have in common?
They have the same period of revolution.
They have the same period of rotation.
They have the same diameter.
They are small and have rocky surfaces.

4. What do all of the inner planets have in common?
They have the same period of revolution.
They have the same period of rotation.
They have the same diameter.
They are small and have rocky surfaces.

5. Venus and Earth are much alike in terms of
their size and density.
their rates of rotation.
their atmospheres.
their direction of rotation.

6. Venus and Earth are much alike in terms of
their size and density.
their rates of rotation.
their atmospheres.
their direction of rotation.

7. What do the Gas Giants have in common?
They have are made of ice
They are about the size of Mars
They do not have solid surfaces
They have very few moons

8. What do the Gas Giants have in common?
They have are made of ice
They are about the size of Mars
They do not have solid surfaces
They have very few moons

9. The great red Spot is a huge storm on
Jupiter
Saturn
Neptune
Mars

10. The great red Spot is a huge storm on
Jupiter
Saturn
Neptune
Mars

11. There is enough fuel in the sun to last for about another
1 billion years.
5 billion years.
10 billion years.
15 billion years.

12. There is enough fuel in the sun to last for about another
1 billion years.
5 billion years.
10 billion years.
15 billion years.

13. Uranus is different from most other planets because it
is the farthest from the sun.
is mostly nitrogen and helium.
rotates on its side.
has the most moons.

14. Uranus is different from most other planets because it
is the farthest from the sun.
is mostly nitrogen and helium.
rotates on its side.
has the most moons.

15. Some astronomers think Pluto should not be called a planet because it
is too far away.
has no moons.
is so small.
is almost entirely made of gases.

16. Some astronomers think Pluto should not be called a planet because it
is too far away.
has no moons.
is so small.
is almost entirely made of gases.

17. Identify the letter and the name: These reddish loops link sunspot regions ____________________ Nuclear fusion occurs at ___________________________________ The layer you are viewing when you look at the sun?_____________ The layer seen during a total solar eclipse at totality?_____________ The coolest area of the sun? ________________________________ This is the colored part of the sun’s atmosphere ________________

18. These reddish loops link sunspot regions _E prominences_________ Nuclear fusion occurs at ___ F__the core ______________________ The layer you are viewing when you look at the sun? C_photosphere _ The layer seen during a total solar eclipse at totality?_____A__corona The coolest area of the sun? ___ D sunspots ____________________ This is the colored part of the sun’s atmosphere _B chromosphere__

19. Which of these planet’s orbits is closest to Earth’s orbit
Which of these planet’s orbits is closest to Earth’s orbit?_____________________________________ Which planet has a “day” that is most similar in length to a day on Earth?__________________________ As distance from the sun increases, period of revolution__________________ Which planet has the shortest day? ___________________

20. Which of these planet’s orbits is closest to Earth’s orbit
Which of these planet’s orbits is closest to Earth’s orbit?__________Mars___________________________ Which planet has a “day” that is most similar in length to a day on Earth?_________Mars________________ As distance from the sun increases, period of revolution____increases______________ Which planet has the shortest day? _Jupiter__________________

21. Which of the following is NOT a terrestrial planet?
Mars
Venus
Saturn
Mercury

22. Which of the following is NOT a terrestrial planet?
Mars
Venus
Saturn
Mercury