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