Across
- 2. Electromagnetic waves with long wavelengths and low frequencies.
- 3. An object with more than four solar masses squeezed into a ball.
- 5. Vast arragement of electromagnetic waves.
- 12. Electromagnetic waves that are very high energy and are use in medical and astronomical applications.
- 13. Large cloud of gas and dust.
- 15. A unit of length equal to the distance that light travels through space in 1 year.
- 16. Electromagnetic waves with longer wavelengths than visible light.
- 18. The distance between any two corresponding points that are adjacent on a wave.
- 19. Areas of stars that spread out from the center of the spiral galaxy.
- 20. The death of a large star explosion
- 21. A representation of an object that is accurate in its proportions to the actual object.
- 22. Used in astronomy as a standard unit to compare the size of other stars with our Sun.
Down
- 1. How fast light travels, 300,000km/sec.
- 4. A large grouping of stars in space.
- 6. Provide us with visible light spectrum,the colors we see.
- 7. An instrument that collects light or other electromagnetic radiation.
- 8. Beginning point at which something begins, or from which it derives.
- 9. The luminous celestial body around which the Earth and other planets revolve; composed mainly of hydrogen and helium.
- 10. Electromagnetic waves with a shorter wavelength than visible light.
- 11. transfer if energy through matter or space as electromagnetic waves.
- 14. A theory that says the universe began as a small point that expanded rapidly about 13.7 billion years ago.
- 17. All space contains.