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Dreyer is an observational astronomer known for cataloging nebulae and star clusters. His work is pivotal in understanding the distribution of gas and dust in space.
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Emission Nebula: A cloud of ionized gas emitting light of various colors, often associated with regions of star formation.
Dark Nebula: A dense cloud of gas and dust that blocks light from objects behind it, making it appear dark against the background.
Star Cluster: A group of stars bound together by gravity, often found within or near regions rich in interstellar gas and dust.