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The waterfall nebula, designated as HH-222. Image Credit: Z. Levay (STScI/AURA/NASA), T.A. Rector (U. Alaska Anchorage) & H. Schweiker (NOAO/AURA/NSF), KPNO, NOAO

No one knows how the Waterfall Nebula was created. It’s one of the mysterious structures found in the sky, according to NASA’s Astronomy Picture of the Day site.

Designated HH-222, the elongated gaseous stream stretches about ten light years and emits an unusual array of colors.

Click here to read some very interesting thoughts on why. One hypothesis has to do with a black hole.