Across
- 2. the outer layers of a star
- 4. range of wavelengths that stars emit
- 6. a large could of gas and dust
- 9. a region of a neutron star that is so dense nothing can escape from it; not even light
- 10. the core of a collapsed star
- 11. when the interior of a star collapses
- 12. the measure of the amount of light that is received on Earth.
- 14. an instrument that can spread the light into different wavelengths
- 15. a massive group of single stars, star systems, star clusters, dust, and gas bound by gravity.
- 16. the explosion of a star collapsing
- 18. active, young galaxies with black holes at their center
Down
- 1. the distance light travels in one year.
- 3. a galaxy that has no regular shape and are generally bright, young stars.
- 5. the theory that suggests the universe probably began about 13.7 billion years ago with an enormous explosion.
- 7. patterns of stars in the night sky.
- 8. a type of galaxy that is in the shape of round or flattened balls and contains only old stars.
- 13. measures the amount of light a star gives off
- 17. a type of galaxy that has a bulge in the middle and arms that spiral outward like the Milky