| Uranus and Neptune are known as ____ giants. |
carbon dioxide |
| Mars has red ____ dust covering its surface. |
comet |
| A ____ is a natural or artificial body that revolves around a planet. |
ice |
| The point in the sky directly above you is the ____. |
iron oxide |
| Venus has a very dense, mostly ____ atmosphere. |
meteor |
| As a ____ orbits the Sun, its tail is blown away from the Sun. |
satellite |
| Since the Moon has no atmosphere, it has no ____ or weather. |
wind |
| A ____ entering the Earth's atmosphere looks like a shooting star. |
zenith |
