Across
- 2. a tool used to observe the universe
- 3. a rock that enters the atmosphere
- 6. EM radiation we can see
- 8. the brightness of a star
- 12. not even light can escape it
- 13. a body made mostly of ice
- 14. energy
- 15. the process that produces energy in a star
- 17. a chart that classifies the stars
- 18. a rocky body orbiting a star
- 21. the distance between two waves
- 22. EM radiation with the highest frequency
- 23. a rounded body orbiting a star
- 24. how hot a star is
- 25. a small hot star
Down
- 1. a collection of stars and other objects held together by gravity
- 4. a squashed oval shape
- 5. the rate at which an event occurs
- 7. when a super red giant implodes
- 9. a giant cloud of gas and dust
- 10. a rounded body that orbits a planet
- 11. when spectral lines are moved to longer wavelengths
- 16. EM radiation with the longest wavelength
- 19. a large cool old star
- 20. used to find the elements present in a star