front 1 The collection of eight planets and their moons in orbit around the sun | back 1 Solar System |
front 2 A ball of frozen dust and rock that orbits the sun and has a tail | back 2 comet |
front 3 the name of the inner planets | back 3 terrestrial |
front 4 a natural object that orbits a planet | back 4 moon |
front 5 the galaxy containing the solar system | back 5 milky way |
front 6 a small rocky body orbiting the sun | back 6 asteroid |
front 7 a collection of stars, dust, and gas bound together by gravity | back 7 galaxy |
front 8 the distance light travels in one year | back 8 light year |
front 9 the movement of an object around another objective | back 9 revolution |
front 10 a force that pulls an object towards each other | back 10 gravity |
front 11 the region of the solar system between the orbits of mars and jupiter | back 11 asteroid belt |
front 12 a small body of matter from outer space of matter from outer space that enters the earth atmosphere appearing as a streak of light | back 12 meteor |
front 13 a large round pit caused by the impact of a meteoride | back 13 crater |
front 14 the spinning motion of a planet on its axis | back 14 rotation |
front 15 a mixture of gasses that surrounds a planet or moon | back 15 atmosphere |
front 16 a celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classified as such | back 16 dwarf planet |
front 17 all of space and everything in it | back 17 universe |
front 18 a celestial body moving in an elliptical orbit around a star | back 18 planet |
front 19 a big ball made of gas | back 19 star |
front 20 gas giant | back 20 a large planet mostly composed of helium and/or hydrogen |
front 21 orbit | back 21 a regular, repeating path that one object in space takes around another one |
front 22 revelotion | back 22 the object's orbital motion around another object |
front 23 Kuiper belt | back 23 a doughnut shaped region of icy objects beyond the orbit of Neptune |