NASA’s Astronomy Picture of the Day (APOD) is a well-established feature on the Internet.  Many are of interest only to specialists, but now and again one comes up that’s a work of art in its own right.  This one seems to qualify.

It’s of the M2-9 Planetary Nebula, which is about 2,100 light years from Earth.  The photograph was published on September 15th this year.  (Follow that link for a much larger version of the image.)

Spectacular, isn’t it?  Does anyone know how large those hourglass shapes are, in terms of light-years in length or other measurements?  Wikipedia doesn’t say.



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