Unit 7 Space Extra Credit

4. A cloud of gas that forms a star
5. When the Moon passes between an observer on Earth and the Sun
6. We percieve this on Earth as heat and light.
9. small atomic nuclei combine to form larger nuclei, This releases energy.
10. The death of a massive star, it spreads these elements into space in an explosion.
11. An elongated shape that planets orbit in.
12. states that the universe began as an extremely hot, dense point about 13.8 billion years ago and has been expanding ever since
16. A force that is dependent on mass. It keeps planets and moons in orbit
17. the creation of heavier elements inside stars through fusion

1. faint radiation left over from the early universe. You can detect this with a satellite or radio when no other signals are detected
2. a word used to describe incoming Solar radiation
3. The reflectivity of a surface, causes dark surfaces to absorb more heat
7. A Phase of the moon in which only half of the moon is visible, and its still getting brighter each night
8. A plot of stars that compares luminosity, temperature and color
13. 23.5 degrees on Earth, Causes different seasons
14. how stretched an orbit is, scale from 0 to 1
15. The apparent change in wave frequency caused by motion, motion away causes a red shift. evidence for the big bang