1. The Earth, the Moon, and the Sun

2. What do we call a scientist who studies the planets and stars?
astronomer

3. How long does it take for the Earth to revolve around the sun?
365 1/4 days

4. How long does it take for the Earth to rotate on its axis?
24 hours

5. What does the tilt of the earth on its axis cause?
the seasons

6. More direct rays from the sun cause ________.
summer
Slanted rays from the sun cause _______.
winter

7. Earth is the _______ planet from the sun.
third

8. Earth’s surface is constantly _________.
changing
Earth’s surface is three-fourths _______.
water

9. What 2 things make it possible for there to be life on Earth?
Water & Air

10. What is at the center of our solar system?
SUN

11. How much bigger is the sun’s diameter than the Earth’s?
110 times

12. How far away is the sun from the Earth?
million miles

13. What is the sun made of?
Hot, glowing gases

14. What are the dark patches visible on the sun’s surface?
Sunspots

15. the moon
What is the Earth’s only natural satellite?

16. How far away is the moon from the Earth?
250,000 miles

17. One-fourth the size of the Earth
How big is the moon compared to the Earth?
One-fourth the size of the Earth

18. The moon has extreme temperatures
The moon has extreme temperatures. This means it is very ______ in the daytime and very ______ at night.
hot
cold

19. Why is it not possible for there to be life on the moon?
No air & little water

20. Craters, mountains, and flat plains
What is the moon’s surface covered with?
Craters, mountains, and flat plains

21. We learned about the moon when:
Astronauts collected rocks and soil from the moon
Astronauts set up experiments on the moon

22. What is the moon phase when we see all of the lighted side of the moon?
full

23. What is the moon phase when all of the lighted side of the moon is turned away from us?
new

24. When the moon is ________ we see more of the lighted side each night.
waxing
When the moon is _______ we see less of the lighted side each night.
waning

25. During which moon phase do we see only a very small part of the lighted side?
Crescent

26. During which phase do we see almost all of the lighted side of the moon?
Gibbous

27. During which moon phase is the moon between the Earth and the sun?
New Moon

28. Aristotle and Ptolemy Who believed in an earth-centered solar system?
Sun
Earth
Aristotle and Ptolemy

29. Galileo and Copernicus
Who believed in a sun-centered solar system?
Sun
Earth
Galileo and Copernicus

30. Who built the first telescope?
Galileo