Science vocab

4. A fixed point in the night sky that is a large, remote incandescent body like the sun.
7. The uniform microwave radiation remaining from the Big Bang.
9. A part of something abstract, especially one that is essential or characteristic.
12. Motion of solid medium.
14. An elastic wave in the Earth produced by an earthquake or other means.
15. A region of space having a gravitational field so intense that no matter or radiation can escape.

1. A star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
2. A theory about how the universe started.
3. An attracting force.
5. A very large star of high luminosity and low surface temperature.
6. An increase or decrease in the frequency of sound, light, or other waves.
8. A nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.
10. The displacement of spectral lines toward longer wavelengths in radiation from distant galaxies and celestial objects.
11. Elastic Wave.
13. The distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.