Across
- 2. a natural force by which objects attract each other
- 6. a large, bright ball of gas performing fusion
- 8. producing a lot of light
- 11. a reaction where hydrogen is combined into helium, releasing energy, light, and heat
- 12. a measurement in degrees showing the heat of something
- 13. a powerful gravity well that even light cannot escape
- 14. a huge collection of stars and planets
- 15. a collapsed star that is incredibly dense
Down
- 1. a young star, made of contracting gases
- 3. type of star that is incredibly large and brighter than a giant
- 4. type of star that is very large but with relatively low temperature
- 5. the amount of matter in an object
- 7. type of star appearing as a continuous band on plots of color vs brightness
- 9. a powerful and bright stellar explosion
- 10. the closest star to Earth that we orbit around