Chapters 25, 26 Review

Chapters 25, 26 review

1. Which model believes that the Earth and other planets revolve around the sun.
2. What does AU stand for?
3. What is an AU?
4. Which model believes that Earth is stationary and the Sun and planets revolved around it.
5. Saturn’s rings are made of what?
6. The lack of a/an ______allows the moon’s surface temperature to vary tremendously.
7. ______are low, flat plains formed by ancient lunar lava flows.
8. What gas gives Uranus a distinct blue-green appearance?
9. Name the four types of galaxies.
10. Venus’s thick atmosphere is composed mostly of what gas?
11. An object whose gravity is so great that not even electromagnetic energy can escape it is called what?
12. What is the closest star to planet Earth?
13. Which planet would you expect to find Europa andIo orbiting?
14. Neptune’s bluish color comes from what gas?
15. Round depressions on the moon caused by meteoroid impacts are called what?
16. What celestial object is made up of ice and rock that partially vaporize then they pass near the sun?
17. Which planet’s rings are the largest and most visible from Earth?
18. The sun’s energy is produced by the fusion of ______into helium.
19. Which planet shows evidence of having a great deal of water at some time?
20. What element makes up the majority of the sun’s mass?
21. Planetesimals grew by ______, which is the process of adding mass by colliding with other planetesimals.
22. Starting from the inside, name the three layers of the sun’s atmosphere.
23. How many years are in one period of revolution for the Earth?
24. Most asteroids are less than ______km in diameter.
25. The sun’s interior consists of the ______, the ______, and the ______.
26. The brightness of a star as it appears from Earth is known as ______brightness.
27. What compound does Earth have on it that makes life possible? Other planets do not have this compound.
28. What do astronomers call a large cloud of gas and dust spread out over a large volume of space?
29. Stars spend about what percentage of their lives on the main sequence?
30. What characteristic allows us to determine the surface temperature of a star?
31. Areas of gas on the photosphere that are cooler than surrounding areas are called what?
32. The sun produces energy through the process of nuclear ______.
33. A sudden release of energy from the sun is called a ______.
34. What do you call the small, dense remains of a low- or medium-mass star?
35. The apparent change in position of an object with respect to a distant background is called what?
36. What is the name of our galaxy? What type is it?