| A | B |
|---|
| corona | solar wind produced by this sun part |
| Mercury | smallest terrestrial planet |
| Venus | day longer than year planet |
| Earth | water planet |
| Moon | natural satellite of Earth |
| Mars | inner planet once with flowing water |
| gravity | keeps planets orbiting the sun |
| inner planets | terrestrial |
| asteroid belt | found between Jupiter and Mars |
| gas | four largest planets' composition |
