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