Astronomy Picture of the Day

                         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.

                              2018 September 28
                                      [2]
                      The Light, the Dark, and the Dusty
               Image Credit & Copyright [3] : Tasos Liampos [4]

Explanation: This colorful skyscape spans about two full moons across nebula
rich starfields along the plane of our Milky Way Galaxy in the royal northern
constellation Cepheus [5] . Near the edge of the region's massive molecular
cloud some 2,400 light-years away, bright reddish emission region Sharpless
[6] (Sh) 155 is below and right of center, also known as the Cave Nebula [7] .
About 10 light-years across the cosmic cave's bright walls of gas are ionized
by ultraviolet light from the hot young stars around it. Dusty blue reflection
nebulae, like vdB [8] 155 at upper left, and dense obscuring clouds of dust
[9]  also abound on the interstellar canvas. Astronomical explorations [10]
have revealed other dramatic signs of star formation, including the bright red
fleck of Herbig-Haro [11]  (HH) 168. Near top center in the frame, the
Herbig-Haro object emission is generated by energetic jets from a newborn
star. [12]

                  Tomorrow's picture: 55 nights with Saturn

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    Authors & editors: Robert Nemiroff [24] (MTU [25] ) & Jerry Bonnell [26]
                                  (UMCP [27] )
          NASA Official:  Phillip Newman Specific rights apply [28] .
              NASA Web Privacy Policy and Important Notices [29]
              A service of: ASD [30]  at NASA [31]  / GSFC [32]
                           & Michigan Tech. U. [33]
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Site notes:
  [1] archivepix.html
  [2] image/1809/Sh2-155CaveNebula_Liampos.jpg
  [3] lib/about_apod.html#srapply
  [4] mailto: lgtasos [at] otenet [dot] gr
  [5] http://earthsky.org/brightest-stars/ star-errai-future-north-star
  [6] http://adsabs.harvard.edu/abs/1953ApJ...118.....
  [7] ap170323.html
  [8] http://adsabs.harvard.edu/abs/1966AJ.....71.....
  [9] http://www.atlasoftheuniverse.com/darknebs.ht...
  [10] https://arxiv.org/abs/0909.5326
  [11] http://en.wikipedia.org/wiki/ Herbig%E2%80%93Haro_object
  [12] http://heritage.stsci.edu/1999/35/index.html
  [13] ap180927.html
  [14] archivepix.html
  [15] lib/apsubmit2015.html
  [16] lib/aptree.html
  [17] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apo...
  [18] calendar/allyears.html
  [19] /apod.rss
  [20] lib/edlinks.html
  [21] lib/about_apod.html
  [22] http://asterisk.apod.com/discuss_apod.php?dat...
  [23] ap180929.html
  [24] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [25] http://www.phy.mtu.edu/
  [26] https://antwrp.gsfc.nasa.gov/htmltest/jbonnel...
  [27] http://www.astro.umd.edu/
  [28] lib/about_apod.html#srapply
  [29] https://www.nasa.gov/about/highlights/HP_Priv...
  [30] https://astrophysics.gsfc.nasa.gov/
  [31] https://www.nasa.gov/
  [32] https://www.nasa.gov/centers/goddard/
  [33] http://www.mtu.edu/

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