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The planet Neptune had a great dark spot. It soon vanished after discovery, leading astronomers to believe it was just a temporary storm, unlike the Great Red Spot on Jupiter which has been raging for hundreds of years. See the related link for more information.
The Horsehead Nebula, one of the most famous dark nebulae, is located in the constellation Orion. 1  Emission nebulae are huge bright gas clouds with irregular shapes and dimensions that span many light years across. Emission nebulae are where stars are born. When stars begin to shine, they heat up the remaining gas around them and that gas starts to shine as well. One of the most famous emission nebula is M42, which is located in the constellation Orion.