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astronomy
| Question | Answer |
|---|---|
| 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. |