1. Venus - this planet has a dense atmosphere of carbon dioxide
2. Planets - these celestial bodies shine by reflected light
3. Jovian planets - Jupiter, Saturn, Uranus, Neptune
4. Mercury - planet closest to the sun
5. Comets - these members of the solar system are made of ice and dust
6. Asteroids - these masses of rock orbit between Mars and Jupiter
7. Axis - the Earth rotates on this
8. Orbit - a revolution around the sun
9. Terrestrial planets - Mercury, Venus, Earth, Mars
10. Mars - this planet is referred to as the "red" planet
