Astronomy Crossword

4. Earth's pull on objects toward the center of the planet
5. A different star after hydrogen runs out and is the outcome of a bigger star
6. Outbursts of light that occur in areas of sunspot activity
8. How bright the star appears to an observer on Earth
9. Outer layer of atmosphere
11. Shows how fast galaxies are moving away from one another
12. After red giant
13. Distance light travels in one year
15. Distance between the earth and sun
16. The idea of matter and energy compressed into a single dense point that exploded into an ever expanding universe
19. Increased blasts that interfere with radio and T.V reception
20. Nuclear Reaction

1. Stars begin as cloud of dust and gas
2. After smaller nova shrink
3. Second densest object in universe
7. Dark and cool spots on photosphere
8. Lumonosity of stars as if they were seen from the same distance from the Earth
10. System containing millions of billions of stars that orbits a common mass and travel as a unit
14. Actual or true brightness of a star
17. Most dense object in whole universe
18. AFter main sequence and a smaller star