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“NGC6888 the Crescent Nebula”

The Crescent Nebula, in its blue-and-orange glory.
The Crescent Nebula, in its blue-and-orange glory. Image: © Bray Falls

If you squint, the Crescent Nebula looks a lot like a brain. It’s actually 25 light-years across, and ejects the equivalent of the Sun’s mass every 10,000 years, according to NASA.