Across
- 2. the death of a large star by explosion
- 5. a mass of gas held together by its own gravity
- 6. which something begins
- 8. an instrument that collects light
- 11. the distance between any two corresponding points
- 12. large cloud of dust in space
- 13. an object that is accurate in its proportions
- 14. a unit of length of light that travels in space
- 15. to compare the size of other stars with our sun
- 17. energy through matter or space
- 18. determine if any object is moving toward us
Down
- 1. a large grouping of stars in space
- 3. waves with a shorter wavelength
- 4. all space and the matter space contains
- 7. long wavelengths and long frequencies
- 9. a body which the earth and other planets resolve
- 10. wave with very high energy and no mass
- 13. how fast light travels
- 15. stars that spread out from the galaxy
- 16. electromagnetic waves that are very high energy