| A | B |
|---|
| star | large ball of glowing gas in space |
| light-year | distance light travels in a year-9.5 trillion kilometers |
| parallax | observing the true distance of a star using two different perspectives; the closer a star the greater the __________ |
| star color | blue- hot; red-cool; yellow- medium |
| apparent brightness | star's light when viewed from earth- distance makes it dimmer |
| absolute brightness | brightness of star in actual measurement |
| Hertzsprung-Russell Diagram | Table used to estimate size of stars and how they change over time |
| supergiants | very bright statrs in the upper right H_R diagram |
| giants | large bright stars in the Middle of the H-R diagram |
| dwarfs | in lower part of H-R diagram- smaller and dimmer |
| causes star's death as white dwarf or black hole | dwindling supply of fuel in star's core |
| planetary nebula | dying star surrounded by clouds and dust |
| supernova | violent explosion of dying star |
| later stages of a low mass star | red giant |
| later stage of a high mass star | red supergiant |
| pulsar | strong radio waves from a spinning star |
| black hole | mass whose surface gravity pulls light back into itself as it collapses |
| Big Bang | 13.7 Billion years ago |
| Formation of sun and solar system | 4.6 Billion years |
