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nebula a large cloud of gas and dust in interstellar space.
solar nebula the cloud of gas and dust formed in our solar system.
nuclear fusion the combination of the the nuclei of small atoms to form a larger nucleus releases energy.
sunspots a dark area of the photosphere.
crust the thin solid outer layerof the earth.
mantle the layer of rock between the earth's crust and core.
core the central part of the earthbelow the mantle
orbit the path that a body follows as it travels.
Created by: owen12