Astronomy Crossword

3. Increased blasts that interfere with radio and T.V reception
6. Most dense object in whole universe
8. After smaller nova shrink
9. System containing millions of billions of stars that orbits a common mass and travel as a unit
10. Shows how fast galaxies are moving away from one another
11. Distance between the earth and sun
13. Earth's pull on objects toward the center of the planet
15. The idea of matter and energy compressed into a single dense point that exploded into an ever expanding universe
17. Dark and cool spots on photosphere
18. How bright the star appears to an observer on Earth
20. Outer layer of atmosphere

1. After red giant
2. Nuclear Reaction
3. A different star after hydrogen runs out and is the outcome of a bigger star
4. Second densest object in universe
5. Stars begin as cloud of dust and gas
7. Distance light travels in one year
12. Lumonosity of stars as if they were seen from the same distance from the Earth
14. Outbursts of light that occur in areas of sunspot activity
16. Actual or true brightness of a star
19. AFter main sequence and a smaller star