           APOD: 2017 October 26 - NGC 7635: Bubble in a Cosmic Sea

                         Astronomy Picture of the Day

    Discover the cosmos! [1] Each day a different image or photograph of our
 fascinating universe is featured, along with a brief explanation written by a
                           professional astronomer.

                                2017 October 26
                                      [2]
                      NGC 7635: Bubble in a Cosmic Sea
              Image Credit & Copyright [3] : Rolf Geissinger [4]

Explanation: Adrift in a cosmic sea of stars and glowing gas [5] the delicate,
floating apparition left of center in this widefield view is cataloged as NGC
7635, the Bubble Nebula. A mere 10 light-years wide, the tiny Bubble Nebula
was blown by the winds of a massive star. It lies within a larger complex of
interstellar gas and dust [6] clouds found about 11,000 light-years [7]
distant, straddling the boundary between the parental constellations Cepheus
[8]  and Cassiopeia [9] . Included in the breathtaking vista is open star
cluster M52 [10]  (lower left), some 5,000 light-years away. Above and right
of the Bubble Nebula is an emission region identified as Sh2-157 [11] , also
known as the Claw Nebula. Constructed from 47 hours of narrow-band and
broad-band exposures, this image spans about 3 degrees on the sky. That
corresponds to a width of 500 light-years at the estimated distance of the
Bubble Nebula [12] .

                    Tomorrow's picture: Mirach's Ghost [13]

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  [7] http://en.wikipedia.org/wiki/Light_year
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  [9] http://www.hawastsoc.org/deepsky/cas/
  [10] http://www.messier.seds.org/m/m052.html
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