Astronomy Picture of the Day

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

                                2019 July 23
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                    M82: Galaxy with a Supergalactic Wind
      Image Credit: [3]NASA, [4]ESA, [5]Hubble; Processing & Copyright:
                               [6]Daniel Nobre

   Explanation: Why is the Cigar Galaxy billowing red smoke? [7]M82, as
   this [8]starburst galaxy is also known, was stirred up by a [9]recent
   pass near large [10]spiral galaxy [11]M81. This doesn't fully explain
   the source of the red-glowing outwardly [12]expanding gas and dust,
   however. [13]Evidence indicates that this gas and dust is being driven
   out by the combined emerging [14]particle winds of many stars, together
   creating a galactic [15]superwind. The dust particles are [16]thought
   to originate in M82's interstellar medium and are actually [17]similar
   in size to particles in cigar smoke. The [18]featured photographic
   mosaic highlights a specific color of red light strongly emitted by
   ionized [19]hydrogen gas, showing detailed filaments of this gas and
   dust. The filaments extend for over 10,000 [20]light years. The
   12-million light-year distant [21]Cigar Galaxy is the brightest galaxy
   in the sky in [22]infrared light, and can be seen in visible light with
   a small [23]telescope [24]towards the [25]constellation of the Great
   Bear ([26]Ursa Major).

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                      Tomorrow's picture: zodiacal road
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    Authors & editors: [60]Robert Nemiroff ([61]MTU) & [62]Jerry Bonnell
                                 ([63]UMCP)
          NASA Official: Phillip Newman [64]Specific rights apply.
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                A service of: [66]ASD at [67]NASA / [68]GSFC
                           & [69]Michigan Tech. U.

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