Across
- 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
Down
- 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