Across
- 3. a very large star of high luminosity and low surface temperature.
- 8. An extremely large red giant star with a minimum of 15 solar masses.
- 9. a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
- 10. a cloud of gas and dust in outer space.
- 12. a small, old, relatively cool star.
Down
- 1. a small very dense star that is typically the size of a planet.
- 2. a contracting mass of gas which represents an early stage in the formation of a star.
- 4. a region of space having a gravitational field so intense that no matter or radiation can escape.
- 5. a star around which the earth orbits.
- 6. a celestial object of very small radius.
- 7. a bluish star that has a high surface temperature and a diameter that is large relative to the sun.
- 11. a very small cooled remnant of white dwarf that emits no detectable light.