Across
- 1. a collection of stars, dust, and gas bound together by gravity.
- 5. the brightness of a star as seen from Earth
- 6. a star that has collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons
- 7. A small hot dim star that is left over center of an old sun like star
- 9. space and all the mater and energy in it.
- 10. A gigantic explosion in which a massive star collapses and throws its outer layers into space
- 11. the distance that light travels in a year; about 9.45 trillion kilometers
- 12. the actual brightness of an object such as a star
Down
- 2. A measure of how bright a star would be if it were seen from a standard distance
- 3. Hertzsprung-Russell diagram a graph that shows the relationship between a star's surface temperature and absolute magnitude
- 4. All of the frequencies or wavelengths of electromagnetic radiation
- 8. a large cloud of gas and dust in interstellar space; a region where stars are born.