Across
- 1. the early phase of a star
- 6. spherical objects in space that radiate energy from their hot cores
- 7. omething that causes the light from the sun to hit the earth at different angles
- 8. what is left when a supernova explodes
- 9. change in a wavelength
- 11. what matter space is filled with
- 12. diagram showing the life of a star and how stars do not stay the same ever
- 15. burn there hydrogen fuel very quickly
- 16. Hydrogen atoms combine to form the heavier element helium
- 17. when a white dwarf cools
- 18. stronomer that proposed that the earth revolves around the sun
- 19. the very starting form of a star
Down
- 2. when massive stars collapse in on themselves and explode
- 3. stars that last about ten billion years
- 4. an italian astronomer that confirmed copernicus'sproposal
- 5. when stars start to slow down and get dim
- 10. stars that burn really slow and are very dim
- 12. stars that burn there fuel really fast and have a very short life
- 13. stars thought to be as hot as 100 000 000°C and may take trillions of years to cool
- 14. used by astronomers to see through dust into space