Space Vocabulary

1. The distance that light travels in a year;about 9.46 trillion kilometers.
6. The actual brightness of an object such as a star.
7. Hertzsprung-Russell diagram a graph that shows the relationship between a star's surface temperature and absolute magnitude.
8. all of the frequencies or wavelengths of electromagnetic radiation.
9. A star that has collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons.
10. A large cloud of gas and dust in interstellar space; a region where stars are born.
12. The brightness of a star as seen on Earth.

2. A measure of how bright a star would be if it were seen from a standard distance.
3. A gigantic explosion in which a massive star collapses and throws its outer layers into space.
4. Space and all the matter and energy in it.
5. A small hot dim star that is the left over center of an old sun-like star.
11. A collection of stars, dust, and gas bound together by gravity.