protoplanet - a large body of matter in orbit around the sun or a star and thought to be developing into a planet, exoplanet - a planet that orbits a star outside the solar system., dwarf planet - a celestial body that -orbits the sun, has enough mass to assume a nearly round shape, has not cleared the neighborhood around its orbit and is not a moon, cosmology - the science of the origin and development of the universe., astronomy - the branch of science which deals with celestial objects, space, and the physical universe as a whole., supernova - a star ending its life in a huge explosion., nova - a star that explosively sheds its outer layers without destroying itself.,

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