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Science Chap. 2 Voc.

TermDefinition
asteroid a chunk of rock or iron less than 1,000 km (621 mi) in diameter that orbits the sun.
universe everything that exists, including galaxies and everything in them.
star a huge ball of very hot glowing gases in space that produces its own light and heat.
dwarf planet a nearly round body, slightly smaller than a planet, whose orbit crosses the orbit of another body.
comet a chunk of frozen gases, rock, ice, and dust orbiting the sun.
astronomy the study of objects in space and their properties.
galaxy a group of billions of stars, objects that orbit those stars, gas, and dust.
solar system a star and all the planets and other objects that revolve around it.
planet a large, round body that revolves around a star.
Created by: mariajharvey
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