Astronomy Crossword

2. Distance light travels in one year
4. Nuclear Reaction
5. How bright the star appears to an observer on Earth
9. Distance between the earth and sun
10. Shows how fast galaxies are moving away from one another
13. Second densest object in universe
15. The idea of matter and energy compressed into a single dense point that exploded into an ever expanding universe
19. System containing millions of billions of stars that orbits a common mass and travel as a unit

1. After smaller nova shrink
2. Actual or true brightness of a star
3. Dark and cool spots on photosphere
5. Lumonosity of stars as if they were seen from the same distance from the Earth
6. Stars begin as cloud of dust and gas
7. Outbursts of light that occur in areas of sunspot activity
8. Increased blasts that interfere with radio and T.V reception
11. Most dense object in whole universe
12. Outer layer of atmosphere
14. A different star after hydrogen runs out and is the outcome of a bigger star
16. Earth's pull on objects toward the center of the planet
17. After red giant
18. AFter main sequence and a smaller star