| A | B |
|---|
| Mercury | the closest planet to the sun |
| Venus | the planet known as Earth's sister planet |
| Earth | the only known planet with life |
| Mars | the 4th planet from the sun that is covered with pink dust |
| Jupiter | this planet has the Great Red Spot |
| Saturn | This planet is most famous for its rings |
| Uranus | The 7th planet from the sun, it rotates sideways in its orbit |
| Neptune | Most of the time this planet is 8th from the sun, but sometimes it is 9th |
| Pluto | the smallest planet in our solar system |
| Sun | the star at the center of our solar system |
| asteroid belt | the area between the inner and outer planets that is filled with thousands of asteroids |
| inner planets | the first four planets closest to the sun |
| outer planets | The last five planets in the solar system |
| gravity | the force that pulls objects in the universe to one another |
| rotation | the time it takes a planet to spin once on its axis to make a day |
| revolution | the time it takes a planet to orbit around the sun once to make a year |
| International Space Station | the space station currently being assembled in orbit around Earth |
| moonlight | the light reflected from the sun by the moon on to Earth |
| asteroid | a chunk of metal and rock orbiting around the sun |
| solar system | the sun and all the bodies that orbit around it |
