Across
- 1. a law that states that the farther away a galaxy is, the faster it is moving away from us
- 5. all of space and everything in it
- 6. Parallax can only be used to determine the distance to __ stars
- 8. these stars last 200 billion years
- 12. the blue-white hot core of a star that is left behind after its outer layers have expanded and drifted out into space
- 15. what does pulsar stand for?
- 16. a large cloud of gas and dust in space
- 18. the brightness a star would be if it were at a standard distance from Earth
- 19. brilliant explosion of a dying supergiant star
- 21. what is the name of our galaxy?
- 22. a huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity
- 24. a contracting cloud of gas and dust with enough mass to form a star
- 25. what determines the brightness of a star?
- 26. these stars last 10 billion years
Down
- 2. what do astronomers use to determine the elements found in a star?
- 3. a spinning neutron star that gives off radio waves
- 4. a star is formed when gravity causes the gas and dust of a nebula to become so dense and hot that ___ occurs
- 7. what determines the length of a star's life?
- 8. what type of galaxy is the Milky Way?
- 9. the distance that light travels in one year
- 10. the apparent movement of an object against distant backgrounds
- 11. a graph used to classify stars according to their surface temperature and brightness
- 13. the brightness of a star as seen from Earth
- 14. what color are the coolest stars?
- 17. what color are the hottest stars?
- 20. these stars last 10 million years
- 23. the initial explosion that resulted in the formation and expansion of the universe