Across
- 2. This is about 13.7 billion years old
- 4. This is responsible for the expansion of the Universe
- 7. Makes up only 4-5% of the 'stuff' in the universe. We can see it.
- 8. Name for the beginning of the universe
- 10. Symbol for a barred spiral galaxy with tight arms
- 11. spiral galaxies with elongated central bulges
- 13. Most galaxies show this type of shift
- 15. This has a gravitational pull but cannot be seen
- 18. Galaxy with little dust and gas; old stars.
- 19. A star moving toward the Earth shows this type of shift in its color spectrum
Down
- 1. Red shift and blue shift are due to the ________ effect
- 3. Galaxy type not on Hubble's tuning fork diagram
- 5. The Milky Way and about 40 other galaxies belong to the
- 6. A type of star that varies in luminosity that can be used to find star distance
- 9. The expansion of the universe is
- 12. Scientist that discovered galaxies moving away from us and the universe is expanding
- 13. type of old main sequence stars
- 14. The apparent movement of an object when looking at it with different eyes
- 16. Diagram that helps categorize galaxy types
- 17. Galaxies with a central bulge and arms