| Stars, planets, and comets are ____ objects. |
celestial |
| Mercury is the ____ planet from the Sun. |
charged |
| Venus is the ____ planet from the Sun. |
eighth |
| Neptune is the ____ planet from the Sun. |
first |
| The Earth is the ____ planet from the Sun. |
rotates |
| The Sun emits a stream of ____ particles called the solar wind. |
second |
| Mercury, Venus, Earth, and Mars are ____ (rocky) planets. |
terrestrial |
| Mercury only ____ three times during every two orbits. |
third |
