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stars and galaxies unit review
identify the word(s) or phrase that answers the question or completes the sentence
1. the positions of the constellations appear to change throughout the year because
2. it makes sirius the brightest star in the night sky.
3. what are constellations?
4. what is a measure of the amount of a star's light received on earth?
s. what increases as an object comes closer to an observer?
o. what happens after a nebula contracts and temperatures increase to 10 million k?
7. what is about 20 km in size?
8. what does the sun fuse hydrogen into?
9. what are loops of matter flowing from the sun called?
10. what are groups of galaxies called?
11. which galaxies are sometimes shaped like footballs?
12. what do scientists study to determine shifts in wavelengths of light?
13. the distances to nearby stars can be measured by using -
14. about 90 percent of the stars in space are stars.
15. the hottest stars in space are in color.
16. a main sequence star becomes a after it uses up the hydrogen in its core.
17. the sun produces energy by fusing hydrogen atoms into atoms in its core.
18. the intense magnetic fields of sunspots cause archlike eruptions called -
19. our sun is not _
20. a galaxy that has a shape similar to a football is a(n) galaxy.
21. all of the following are true of the milky way except that it
22. the big bang theory of the formation and expansion of the universe is supported by the observed
23. although it has a greater than sirius, rigel does not look as bright in the night sky.
24. a is a region so dense that nothing, including light, can escape its gravity field.
25. dark, cooler areas on the sun's surface are called _
26. the clouds of magellan are two galaxies orbiting the milky way.
27. the coolest stars in the sky are in color.
28. a group of stars, gas, and dust held together by gravity is a
29. a sequence of star colors from hottest to coolest is
30._ are patterns of stars in the sky.
31. as earth travels in its different constellations are visible at different times of the year.
32. a measure of the amount of the light given off by a star is its
33. a measure of the amount of light received on earth is a star's
34. is the apparent shift in the position of an object when viewed from two locations.
35. a star begins as a , a large cloud of gas and dust.
36. the sun produces energy by forming in its core.
37. prominences and flares on the sun are related to sunspots because they are all caused by
38. the number of observed sunspots, prominences, and flares increases in a cycle that occurs every_
years.
39. our sun is considered average because its temperature and absolute magnitude place it in the range
of the h-r diagram.
40. our sun is unusual because it does not belong to an)
41. two stars orbit each other in a(n) star system.
42. the spiral shape of the milky way galaxy cannot be seen from earth because
43. the states that between 15 and 20 billion years ago, the universe began expanding out of an
enormous explosion.
44. a red shift in the spectrum of the light from an object indicates the object is moving you.