| galileo | | The fuzzy outer layer of a comet. |
| herschel | | Its rings look somewhat like those of a compact disc. |
| extraterrestrial | | This moon of Jupiter has large active volcanoes. |
| gasgiant | | Jupiter, Saturn, Uranus, or Neptune. |
| asteroids | | Hydrogen and _____ make up most of the Gas Giants. |
| io | | He discovered Uranus, which started a new world-wide interest in astronomy. |
| helium | | Pluto's current classification. |
| goldilocks | | It's not a planet anymore! |
| greatdarkspot | | A doughnut-shaped region that stretches from around Pluto's orbit to about 100 times Earth's distance from the sun. |
| charon | | On a comet, it usually points away from the sun. |
| planetoid | | Thought to be a large storm on Neptune, it has since disappeared. |
| terrestrial | | A streak of light in the sky that is produced when a meteoroid enters the Earth's atmosphere. |
| oortcloud | | He did not invent the telescope, but he did discover four of the moons of Jupiter. |
| saturn | | Rocky objects revolving around the sun that are too small to be considered planets. |
| kuiperbelt | | Where we think most comets originate. |
| solid | | One of Jupiter's moons, its surface is icy and full of craters. |
| jupiter | | It rotates on its side, probably because of a huge impact from a space object. |
| rings | | When a meteoroid actually makes it to the surface of the Earth before it completely burns up. |
| meteorite | | A chunk of rock or dust in space. |
| uranus | | We are not sure if it is Pluto's moon or if Pluto is its moon! |
| comet | | Because it seems to have ice that melts and reforms, it is thought that microscopic life could form here. |
| greatredspot | | Small thin disks of rock and ice that are found around the Gas Giants. |
| meteoroid | | Life that exists other than that on Earth. |
| meteor | | The surface of Jupiter is not ____. |
| coma | | Collection of ice, dust and rock that orbits the sun in a very elliptical orbit. |
| pluto | | It's blue-green color is due to methane in its atmosphere. |
| voyager | | ______ conditions - what scientists feel are right for the development of life. |
| tail | | "of the earth" |
| Europa | | Without this probe and its brother, we would know very little about the outer planets. |
| callisto | | A hurricane that has raged on Jupiter with no signs of stopping. |
| neptune | | The largest planet in our solar system. |
