| Term | Definition |
|---|
| Universe | The entire celestial cosmos, an orderly and harmonious system |
| Galaxies | Masses of closed gravitational systems of stars and their satellites |
| Milky Way | The galaxy in which we live |
| Elliptical Galaxy | The most common type of galaxy |
| Spiral Galaxy | A galaxy with arms extending from it |
| Irregular Galaxy | A cluster of stars and satellites without a distinguished shape |
| 13.73 billion years | The approximate age of the universe |
| Gravity | Internal __________ determines the shape of a galaxy |
| Big Bang | Generally accepted theory about the beginning of the universe |
| Red Shift | Indicates that the galaxies are moving away from each other |
| Expanding | The Red Shift indicates that the universe is _____________ |
| HR Diagram | Depicts the classification of stars in the universe |
| Magnitude | A stars brightness |
| Absolute magnitude | The actual amount of light emitted from a star |
| Apparent magnitude | The amount of light actually being seen on earth |
| Parallax effect | How nearby stars distance from earth is determined |
| Main sequence | The most common type of star |
| Blue | The hottest stars in the universe are ____________ in color |
| Red | The coolest stars in the universe are __________ in color |
| Nebula | Gases and dust that start a stars "birth" |
| White dwarf | Our Sun will become this type of star eventually |
| Supernova | An exploding massive star is called a __________ |
| Binary system | Companion stars that appear as one to us on earth |
| Light year | Astronomical measuring unit used by cosmologists |
| Constellations | Groups of stars that appear to form pictures |
| Helium | Stars produce energy by fusing hydrogen atoms into _______atoms |
| Black hole | A region so dense that even light cannot escape it |
| Big Crunch | A theory of the end of the universe that has it collapsing upon itself |
| Neutron star | A star that is highly radioactive and magnetic but very small |
| Pulsar | A neutron star than spins and emits radio waves |
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