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Horsehead Nebula. It's a dark nebula of thick dust, so it can only be seen against the lighter background on the left. The Herschel Space Observatory image on the right is in infrared which can penetrate the dust. ©Mona Evans, “Nebulae” http://www.bellaonline.com/articles/art43407.asp

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Community Post: The Universe In Us

Eyes and Nebulas. ©Mona Evans, “Nebulae” http://www.bellaonline.com/articles/art43407.asp

The Witch Head Nebula. It glows from light reflected from bright supergiant Rigel - Orion's left foot! Although Rigel is blue, the nebula is blue because the dust scatters blue light more efficiently than the longer wavelengths. (Image: George Greany) ©Mona Evans, “Nebulae” http://www.bellaonline.com/articles/art43407.asp

Peony nebula star - WR 102ka - is located in the Peony nebula, the reddish cloud of dust in and around the white circle, surrounding the star. (Image: Spitzer Space Telescope) Mona Evans, "Nebulae" http://www.bellaonline.com/articles/art43407.asp

The Flying Emu is an Australian aboriginal constellation that stretches across the southern skies. It's formed by the dark nebulae against the glowing background, rather than by stars against a dark background. (Image: Barnaby Norris) ©Mona Evans, “Nebulae” http://www.bellaonline.com/articles/art43407.asp

Helix nebula. Images from two telescopes, Spitzer (in infrared) and GALEX (in uv) were combined to get this beautiful image. There was also a bit of input for the area beyond the nebula from NASA’s all-sky Wide-field Infrared Survey Explorer (WISE). ©Mona Evans, “Nebulae” http://www.bellaonline.com/articles/art43407.asp