The Helix Nebula is one of the most well-known and commonly photographed planetary nebulae because it resembles the “Eye of Sauron.” It is also one of the closest bright nebulae to Earth, located ...
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What Is a Nebula?
Hubble Telescope image of the Horsehead Nebula. Credit: T.A.Rector (NOIRLab/NSF/AURA) & Hubble Heritage Team (STScI/AURA/NASA) Nebulae are all but impossible to spot in the night sky, but you'd never ...
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