What causes an aurora?

Related questions

1. Is Aurora Borealis dangerous?
2. Was Rapunzel pregnant?
3. What time of year is best to see the northern lights?
4. Can you see Northern Lights in Anchorage?
5. Why are the northern lights called the aurora borealis?
6. What nationality is Princess Aurora?
7. How long does an aurora borealis last?
8. What is Snow White's real name?
9. What is Aurora the goddess of?
10. Why do auroras happen?

Tags

1. #release
2. #cause
3. #strike
4. #lights
5. #electrons
6. #charged
7. #lower
8. #bottom
9. #light
10. #process
11. #state
12. #atoms
13. #energy
14. #aurora
15. #photon
16. #higher
17. #particles
18. #beautiful
19. #northern
20. #atmosphere
21. #creates
22. #earth