              APOD: 2018 April 19 - NGC 7635: The Bubble Nebula

                         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
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                                2018 April 19
                                      [2]
                         NGC 7635: The Bubble Nebula
Image Credit: NASA [3] , ESA [4] , Hubble Heritage [5]  Team - Reprocessing by
                              Maksim Kakitsev [6]

Explanation: Blown by the wind from a massive star, this interstellar
apparition has a surprisingly familiar shape [7] . Cataloged as NGC 7635, it
is also known simply as The Bubble Nebula [8] . Although it looks delicate,
the 7 light-year diameter bubble offers evidence of violent processes at work.
Above and left of the Bubble's center is a hot, O-type star [9] , several
hundred thousand times more luminous and some 45 times more massive than the
Sun. A fierce stellar wind and intense radiation from that star has blasted
out the structure of glowing gas [10] against denser material in a surrounding
[11] molecular cloud [12] . The intriguing Bubble Nebula and associated cloud
complex lie a mere 7,100 light-years away toward the boastful constellation
Cassiopeia [13] . This sharp, tantalizing view of the cosmic bubble is a
composite of Hubble Space Telescope image data [14]  from 2016, reprocessed to
present [15]  the nebula's intense narrowband emission in an approximate true
color scheme.

                   Tomorrow's picture: pixels in space [16]

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  [2] image/1804/BubbleNebHST_kakitsev2048.jpg
  [3] http://www.nasa.gov/
  [4] http://www.spacetelescope.org/
  [5] http://heritage.stsci.edu/
  [6] https://www.flickr.com/photos/wildespace/
  [7] http://www.exploratorium.edu/ronh/bubbles/ bubbles.html
  [8] http://heritage.stsci.edu/2016/13/
  [9] http://adsabs.harvard.edu/abs/2002AJ....124.3313M
  [10] http://adsabs.harvard.edu/cgi-bin/nph-bib_query?
bibcode=1995A%26A...295..509C
  [11] ap171026.html
  [12] http://archive.ncsa.uiuc.edu/Cyberia/Bima/GMC.html
  [13] http://www.hawastsoc.org/deepsky/cas/ index.html
  [14] http://heritage.stsci.edu/2016/13/fast_facts.html
  [15] https://www.flickr.com/photos/wildespace/40207470644
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