| A | B |
|---|
| Gravity | The force that causes two objects to be pulled together |
| Orbit | the path an object takes around another object |
| Rotation | one complete spin - one day |
| Revolution | one complete trip around the sun |
| Remote Sensing | getting information about an object without touching or directly observing the object |
| Satellite | an object in orbit around another object |
| Gravity | force that causes two objects to be pulled together |
| Terrestrial Planets | rocky, dense, close to the sun |
| Gas Giants | lighter materials, large, spread out |
| Planet | orbits a star, sphere, big enough to clear its orbit |
| Star | gives off energy from nuclear fusion |
| Hubble Space Telescope | orbiting telescope that showed there are billions of galaxies |
| ISS | orbiting laboratory in space |
| Voyager 2 | spacecraft leaving the solar system |
| Kuiper Belt | region of icy objects beyond the orbit of Neptune |
| Oort Cloud | Reigon at the edge of solar system where comets originate |
| Venus | its atmosphere traps heat like -greenhouse effect |
| Mars | Planet with two moons |
| Solar System | sun (a star) and all the objects that travel in orbit around it |
| Milky Way Galaxy | The galaxy where we live |
| one | how many stars in our solar system |
| Proxima Centauri | Closest star besides the sun 4.24 light years away |
| The type of Galaxy we live in | spiral |
| comet | "dirty" snowball that orbits the sun |
| Universe | everything that exists in space that we know |
| Moon | orbits a planet, reflects light, sphere |
| New Horizons | Spacecraft on its way to Pluto launched in 2006 |
| Curiosity | Rover that is exploring mars |
| 8 min | time it takes light to on earth from the sun |
| 1 year | time it takes light from the sun to get to oort cloud |
| 29 days | time it takes moon to orbit earth |
| 365 days | time it takes for earth to orbit the sun |
