Across
- 2. If a star has a luminosity of 1/10, it's 10 times ___ than the sun
- 4. This is the color of the hottest stars
- 13. The size of the universe has ___ since the beginning of time
- 15. Edwin Hubble used visible light from stars and galaxies to prove the universe is ____
- 17. Overall, this group is the coolest type of star
- 19. This type of star tends to be the least bright, overall
- 20. Scientists believe that the universe is 13.7 ___ years old
- 21. Edwin Hubble observed that light waves from stars and galaxies were being ___, implying that they were moving away
- 22. We use __ magnitude to judge stars' brightness as they appear to our eyes
- 23. The first of these were made once galaxies started to form
- 26. If a star has a luminosity of 100, it's 100 times --- than the sun
- 27. Light that appears red to my eyes has __ wavelengths
Down
- 1. When protons, neutrons and electrons were able to first come together, this element was made
- 3. The color of the coolest stars is __
- 5. Brightness compared to the sun (sun=1)
- 6. Overall, these types of stars are the brightest
- 7. When light has low energy, it's wavelengths are ___
- 8. Stars tend to stay in this stage the longest so there's more of them in the sky
- 9. This is what astronomers believed exploded and sent out all the ingredients to make a universe
- 10. As time has gone on, the universe has gotten more ___
- 11. After stars were created, they started to clump together to make ___
- 12. Of all the objects we've been studying, these were the first things made
- 14. This is what astronomers call it when light waves from glowing objects get longer and become more like 'red'.
- 16. This color has the shortest wavelengths
- 18. The temperature of the universe has ___ dramatically since the beginning of time
- 24. Judging the brightness of stars as if they were the same distance from us is ___ magnitude
- 25. When light travels in a short wavelength it has ___ energy