Across
- 3. a gigantic explosion in which a massive star collapses and throws its outer layers into space
- 5. a measure of how bright a star would be if it were seen from a standard distance
- 7. a collection of stars, dust and gas bound together by gravity
- 8. a large cloud of gas and dust in interstellar space; a region where stars are born
- 9. all of the frequencies or wavelengths of electromagnetic radiation
- 10. a small,hot, and dim star that is the leftover center of an old, sun-like star
- 11. the distance that light travels in a year; about 9.46 trillion km
Down
- 1. Hertzsprung-Russell diagram a graph that shows the relationship between a star's surface temperature and absolute magnitude
- 2. a star that has collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons
- 4. space and all the matter and energy in it
- 5. the brightness of a star as seen from Earth
- 6. the actual brightness of an object, such as a star