Week+4

=**Watch the video on Super Novas**=
 * The following questions are based on the first 20 minutes of the video. Answer them on a sheet of paper.**
 * 1. What is a super nova?**
 * 2. What would happen if one struck the earth?**
 * 3. Do super novas have more or less energy than the sun?**
 * 4. How often does a super nova go off?**
 * 5. How often does one occur?**
 * 6. How many stars threaten to explode near the earth?**
 * 7. Name one of them.**
 * 8. What energy do they release?**
 * 9. What do they have the power to do?**
 * 10.What instruments help the scientists to find out what's happening?**
 * 11. Are all super novas the same?**
 * 12. How many types are there?**
 * 13. What question are scientists trying to answer?**
 * 14. When did they see the first super nova?**
 * 15. What happened in 2006?**