Across
- 7. instrument scientists use to spread light into different wavelengths
- 8. measure of the amount of light a star gives off
- 10. a huge group of single stars star systems star dusters dust and gas bound by gravity
Down
- 1. happens from clouds getting hotter
- 2. distance that light travels in one year
- 3. the range of wavelength that stars emit
- 4. round or flattened balls,only old stars
- 5. magnitude measure of the amount of light that received on earth
- 6. activate young galaxies with black males at center
- 9. has a bulge in the middle and arms that spiral outward