Across
- 5. study of the origin and evolution of the universe
- 6. scientist who discovered red shifts in far away galaxies
- 8. the explosion of a star
- 10. what stars use for fusion after there is no more hydrogen
- 11. method GPS satellites use to find the location of a receiver
- 13. large clouds of dust and gas
- 14. end of a star of more than 30 solar masses
- 15. closest star to the sun
- 16. very dense stars the size of cities
- 17. how scientists find out the composition of stars
- 19. brightness of a star as seen from Earth
- 21. stars like the sun finish their lives as a _______
- 22. total amount of energy produced by a star
- 24. 2 x 10^30 kg
- 25. force that is causing the universe's expansion to accelerate
Down
- 1. stars that burn hydrogen are in the _______ on the H-R diagram
- 2. hottest colour of stars
- 3. most common type of galaxy
- 4. how long it takes a satellite to complete one orbit
- 7. distance light travels in a vacuum in one year
- 9. element that needs more energy to fuse than it creates
- 12. orbit satellites that always stay above the same point on Earth are in a _______
- 18. loss of altitude by satellites over time
- 20. an early star
- 23. first satellite in space