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Ch 20 sec 1 &2 vocab
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| Question | Answer |
|---|---|
| a large cloud of gas and dust in interstellar space; a region in space where stars are born | nebula |
| a rotating cloud of gas and dust from which the sun and planets formed | solar nebula |
| the process by which nuclei of small atoms combine to form a new, more massive nucleus; the process releases energy | nuclear fusion |
| a dark area of the photosphere of the sun that is cooler than the surrounding areas and that has a strong magnetic field | sunspot |
| the spin of a body on its axis | rotation |
| the path that a body follows as it travels around another body in space | orbit |
| the motion of a body that travels around another body in space; one complete trip along an orbit | revolution |