| A | B |
|---|
| universe | everything; all existing matter and space |
| star | giant ball of gas–mainly: hydrogen and helium |
| light year | 186,000 miles per second-> m/sec |
| atoms | the basic building block of matte |
| energy | power; to do work from power or heat |
| particle | a piece of something (matter) |
| origin | the beginning |
| Big Bang | a theory about how the universe expanded |
| dense | closely packed together |
| matter | anything that takes up space |
| Astronomical Unit | the distance between the Earth and the Sun |
| 93 million miles | the distance between the earth and sun |
| moon | a satellite that orbits a planet |
| solar system | a star and everything that revolves around it |
| nebula | gas and dust–from a dying star or formation of a new star |
| galaxy | stars, solar systems, gas and dust held together by gravity |
| Milky Way | our galaxy |
| eight | the number of planets in our Solar System |
| fourth | Earth is the ____planet from the sun. |
| Jupiter | the largest planet in our solar system |
| orbit | the path the earth takes around the sun |
| constellation | A group of stars that form a picture or pattern. |
