Red giants & supergiants in the Double Helix Nebula; other stars here are too dim to be seen: http://bit.ly/18BiVab pic.twitter.com/A7jenU8Opw
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@gabaruga That's the Airy disk, seen in any well-sampled, high signal-to-noise and diffraction limited image. See: http://en.wikipedia.org/wiki/Airy_disk