Across
- 2. A star that has used up all its fuel
- 6. This has gravity so strong light can not escape
- 8. Radio waves pulsing from a neutron star
- 13. How we gain knowledge of the universe
- 15. Patterns in the stars
- 16. When a star uses all its hydrogen and now uses helium
- 17. Also called celestial latitude
Down
- 1. Measured in magnitudes
- 3. Explosion that leaves behind a white dwarf
- 4. Used for classification, based on temperature and size
- 5. Help us observe the universe
- 7. The distance light travels in a year or 31 trillion km
- 9. The main fuel for stars
- 10. Change in position of something due to change in viewing position
- 11. This is the nuclear reaction stars use to make energy
- 12. Measure of distance 3.2 light years
- 14. This is what causes the doppler effect