Across
- 4. an object with more than four solar masses squeezed into a ball.
- 5. how fast light travels.
- 8. the luminous celestial body around which the earth and pther planets.
- 10. an instrument that collects light or other electromagnetic radiation and concentrates it for better observation.
- 11. beginning at which something begins.
- 12. the distance between two corresponding points.
- 14. __ radiation radiation consisting of electric and magnetic waves that travel at the speed of light.
- 16. __ waves elctromagnetic waves with long wavelengths and low frequences.
- 17. the transfer of energy through matter and space as electromagnetic waves.
- 19. all space and the matter space contains.
- 21. a large grouping of stars in space.
Down
- 1. __ arms areas of stars that spread out from the center of a spiral galaxy.
- 2. __ waves elctromagnetic waves that arebetween radio waves and infared waves.
- 3. __ waves provide us with visible light.
- 4. a theory that says te universe began as a small point
- 6. __ spectrum vast arrangement of electromagnetic waves in relation of their relation of their wavelengths.
- 7. the death of a large star by explosion.
- 9. __ center rotational center of a huge galaxy such as the milky way galaxy.
- 13. a unit equal to the distance that light travels through spce.
- 15. __ waves ectromagnetic waves with longer wavelengths than visible light.
- 18. large cloud of gas and dust in interstellar space.
- 20. __ mass used in astronomy as a standard unit.