1. Which is a tool that astronomers use?
A) hammer
B) optical telescope
C) moon
D) stethaschopenhagen

2. Which is a tool that astronomers use?
A) steth seeker
B) radio telescope
C) optical probe
D) porsle sight

3. The optical teleschope was invented about how long ago?
A) 400 years ago
B) 300 years ago
C) 200 years ago
D) 100 years ago

4. A radio teleschope collects what?
A) music
B) radio waves
C) sound waves
D) pictures of outerspace.

5. What is something doing when it circles another object? It is.....
A) circling
B) orbiting
C) rotating
D) day

6. What is a force that pulls objects to each other?
A) rotate
B) orbit
C) gravity
D) solar sytem

7. What is the time that it takes the Earth to circle the sun once?
A) day
B) year

8. What is the time that it takes the Earth to spin around once?
A) day
B) year

9. There are _________ planets in the solar system.
A) 10 (counting the sun)
B) nine
C) eight
D) 365 days

10. Every time the Earth orbits the sun, one _________ goes by
A) year
B) month
C) day
D) week

11. Which planet is closest to the sun?
A) Mercury
B) Earth
C) Venus
D) Pluto

12. Which planet is the biggest?
A) Jupiter
B) Mercury
C) Earth
D) Sun

13. The moon shines.
A) False
B) True

14. The solar system includes the planets that orbit _______.
A) the sun
B) nine planets
C) moons
D) once a year

15. We first landed on the moon in.....
A) 1996
B) 1969
C) 2008
D) We haven't yet.

16. How many phases ore there in a moon?
A) 8
B) 4
C) 10

17. It takes about one ___________ for the moon to orbit the Earth.
A) week
B) month
C) 366 days during a leap year
D) 24 hours

18. When the moon looks like a thick eyelash it is called a _____________ moon.
A) crescent
B) full
C) crater
D) Gibbious

19. If Earth were the size of a basketball, the moon would be about the size of a ________________.
A) pinpong ball
B) soccerball
C) balloon
D) tennis ball

20. The most common landforms on the moon are__________.
A) mountians
B) rocks
C) craters
D) lakes