Across
- 2. arms Areas of stars that spread out from the center of a spiral galaxy
- 6. The transfer of energy through matter or space as electromagnetic waves
- 7. of light How fast light travels
- 9. hole An object with more than four solar masses squeezed into a ball
- 10. A galaxy with a bright center and very little dust or gas
- 12. mass Used in astronomy as a standard unit to compare the size of other stars with our sun
Down
- 1. Electromagnetic waves with long wavelengths and low frequencies
- 2. The death of a large star by explosion
- 3. The luminous celestial body around which the earth and other planets revolves
- 4. A large grouping of stars in a space
- 5. Large cloud of gas and dust in interstellar space
- 7. A self-luminous celestial body consisting of a mass
- 8. All space and matter space contains
- 11. waves Electromagnetic wave with longer wavelengths than visible light