ES 10.6 Review

3. the apparent magnitude of a star depends not only on its actual brightness but also on its_______from the earth
4. the lower the apparent magnitude number, the ___________the object
5. what the bubbles are called that are on the surface of the sun
6. outside the chromosphere is a very thin layer called the_______region
8. a massive star system containing millions to billions of stars
9. astronomers think the Milky Way is a ________spiral galaxy with two major arms and several smaller arm segments
11. the outermost layer of the sun’s atmosphere
13. a star’s color depends primarily on its surface _______
14. outside the photosphere is the_____________
16. the most important star to us on Earth
17. Betelgeuse and Antares are__________
18. flamelike columns of gas that continually erupt from the chromosphere

1. one unit used to measure distances to starts is the__________
2. _________magnitude is the brightness of a star as it appears to an observer on the ground
4. a system in which two stars are bound together by gravity
7. our sun is a yellow star near the middle of the____________
10. explosion of a star
12. small, dim starts outside the main sequence
15. visible part of the sun