| A | B |
|---|
| The planet with the lowest density and hundereds of thin rings is ____. | Saturn |
| ___ 's axis of rotation is almost parallel to the plane of its orbit. | Uranus |
| A planet that is very hot because of the greenhouse effect and that has sulfuric acid is ____. | Venus |
| The closest moon to Jupiter, is volcanically active. | IO |
| Johannes Keppler discovered that the orbit in which planets move around the sun is ____. | elliptical |
| Two planets with similar mass and size are ___ & _____. | Venus and Earth |
| The second smallest planet and the one closest to the sun is ____. | Mercury |
| ____ is the largest satellite in the solar system. | Ganymede |
| The largest know volcano known as Olympus Maximus is found on the planet ____. | Mars |
| A planet that is 150,000,000 kms or 1 AU from the sun is _____. | Earth |
| A planet that appears red due to iron oxide in its core is _____. | Mars |
| Methane gives ____ & ____ their blue-green color. | Uranus and Neptune |
| At times the planet ____ is actually farthest from the sun. | Neptune |
| The Great Red Spot, a continuous storm, is located on the planet _____. | Jupiter |
| The largest of ____'s rings, Triton, is larger than the planet Mercury. | Saturn |
| The solid portion of a comet is its _____. | nucleus |
| A cloud of gasses around the solid portion of a comet is known as the _____. | nucleus |
| ____ first discovered the sun-centered model of the solar system in 1543. | Copernicus |
| Two of the inner planets are ___&____. | Mercury, Mars |
| Although ___ is an outer planet, it's more like an inner planet. | Pluto |
| _____ are small pieces of rock moving through space. | meteoroids |
| When small pieces of rock moving through space enter earth's atmosphere and burn up, they are called ______. | meteors |
| Pieces of rock that actually strike Earth's surface are _____. | meteorites |
| The asteroid belt didn't form a planet because ________. | Jupiter's gravity was too strong |
| Most asteroids are located in an area between ___& _____. | Mars and Jupiter |
