Unit three science vocab

1. space and all matter and energy in it.
4. the brightness of a star as seen from earth.
5. hertzprung Russel diagram a graph that shows the relationship between a stars surface temperature and absolute magnitude.
6. a large cloud of gas and dust in interstellar space;a region where stars are born.
7. the distance that light travels in a year; about 9.46 trillion kilometers.
11. a measure of how bright a star would be if it were seen from a standard distance.
12. a star that has collapsed under gravity to the point that electrons and protons have smashed together to form neutrons.

2. all of the frequencies or wavelengths of electromagnet radiation.
3. a gigantic explosion in which a massive star collapses and throws it's outer layer into space
8. a collection of stars,dust,and gas bound together by gravity.
9. the actual brightness of an object such as a star.
10. a small hot dim star that is left over center of an old sun like star.