| A | B |
|---|
| Universe | Everything in space! |
| Big Bang Theory | The theory that everything in the Universe started as a small speck and then exploded |
| Galaxy | A large group of stars |
| Solar System | A system that includes planets, stars, moons, and other objects |
| Nebula | A huge cloud of space dust |
| Nebular Theory | the theory that our solar system was started - a gravity pulling together our star and planets |
| Nuclear Fusion | the process that turns hydrogen into helium and creates a lot of energy inside stars |
| White Dwarf | A small, dim but HOT star that is the end result of a small or average star |
| Supernova | An explosion that results of a massive star being too large |
| HR Diagram | A diagram that shows where stars are in comparison of their temperature and magnitude |
| Magnitude | How bright a star is |
| Apparent Magnitude | How bright a star is from Earth |
| Absolute Magnitude | How bright a star is from 1 AU away |
| Main Sequence | Where most stars fall on the HR diagram |
| The three types of Galaxies | Spiral, elliptical, and irregular |
| Light Year | How we measure distance in space |
| Comet | A 'dirty snowball' made up of ice and dust that has an elliptical orbit |
| Asteroid | A rock that floats around in space - most are found in the best between Jupiter and Mars |
| Meteor | A meteroid that enters Earth's atmosphere and burns up |
| Meteor | A meteor that hits the Earth |
| Moon | A natural satellite of the Earth |
| Planet | A mass thta orbits a star - in our solar system, the Sun |
