front 1 the collection of eight planets and their moons in orbit around the sun. | back 1 Asteroid |
front 2 A ball of frozen dust and rock that orbit the sun and has a tail. | back 2 Asteroid belt |
front 3 the name of the inner planets | back 3 atmosphere |
front 4 a natural object that orbits a planet | back 4 comet |
front 5 The Galaxy containing the solar system | back 5 crater |
front 6 A small rocky body orbiting the sun | back 6 galaxy |
front 7 A collection of star stuff and gas bounce together by gravity | back 7 gas giant |
front 8 The distance light travels in one year | back 8 gravity |
front 9 The movement of an object around another object | back 9 planets |
front 10 A force that pulls objects towards each other | back 10 moon |
front 11 The region of the solar system between the orb of Mars and Jupiter | back 11 milky way |
front 12 A small body of matter from outer space that enters the Earth's atmosphere appearing as a strike of light | back 12 orbit |
front 13 The springing movement of a planet on its axis | back 13 revolution |
front 14 The mixture of gas that surrounds a planet or moon | back 14 rotation |
front 15 a group of planets and other bodies that revolve around a star. | back 15 solar system |
front 16 all of space and everything in it | back 16 star |
front 17 A celestial body moving in an elliptical orbit around the stars. | back 17 terrestrial |
front 18 the outer planets | back 18 dwarf planet |
front 19 A ball of hot gas primarily hydrogen and helium that undergoes nuclear fusion | back 19 light year |
front 20 The past an object follows as it moves around another object | back 20 kuiper belt |
front 21 A region of the solar system that is just beyond the orbit of Neptune | back 21 meteor |
front 22 everything. It includes all of space, and all the matter and energy that space contains | back 22 universe |