Across
- 4. the actual brightness of a celestial object
- 5. a large, bright star with low surface temperature
- 7. a large cloud of gas and dust in space
- 8. the amount of light radiated per second by a star
- 10. a small, hot, very dense star
- 12. an elongated oval shape
- 14. the explosion of a massive star that causes a sudden increase in luminosity
Down
- 1. the measure of a celestial body's brightness as observed from the earth
- 2. a group of stars held together by gravitational attraction
- 3. the small, dense core of a supergiant after an explosion
- 6. a diagonal area on the H-R diagram in which most stars are found
- 9. a system of two stars that revolve around each other
- 11. a planet orbiting a star other than Earth's sun
- 13. a rapidly spinning neutron star that emits pulsating radio waves