revolution - one full orbit around the sun, axis - an imaginary line around which an object spins, solar flare - an explosive eruption of waves and particles into space, rotation - one whole spin of an object on its axis, constellation - a group of stars that forms a pattern, orbit - the path an object takes as it revolves around a star, planet or moon, comet - a frozen mass of different types of ice and dust orbiting the sun, moon - a natural object that revolves around a planet, planet - a large, round object that revolves around a star and has cleared the region around its orbit, dwarf planet - a large, round object that revolves around the sun but has not cleared the region around its orbit, outer planet - any of the four planets in our solar system beyond Mars, inner planet - any of the four closest planets to the sun, asteroid - a rocky mass up to several hundred kilometers wide that revolves around the sun, space probe - a spacecraft that gathers data without a crew,

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