                         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.

                                2019 January 13
                                      [2]
                      Tycho's Supernova Remnant in X-ray
 Image Credit: NASA [3]  / CXC [4]  / F.J. Lu (Chinese Academy of Sciences) et
                                    al. [5]

Explanation: What star created this huge puffball? What's pictured is the hot
expanding nebula of Tycho's supernova remnant [6] , the result of a stellar
explosion first recorded over 400 years ago by the famous astronomer Tycho
Brahe [7] . The featured image [8] is a composite of three X-ray [9] colors
taken by the orbiting Chandra X-ray Observatory [10] . The expanding gas cloud
[11]  is extremely hot, while slightly different expansion speeds have given
the cloud a puffy [12]  appearance. Although the star that created SN 1572
[13] , is likely completely gone, a star dubbed Tycho G [14] , too dim to be
discerned here [15] , is thought to be a companion. Finding progenitor
remnants of Tycho's supernova [16]  is particularly important because the
supernova [17] is of Type Ia, an important rung in the distance ladder [18]
that calibrates the scale [19]  of the visible universe. The peak brightness
of Type Ia supernovas [20]  is thought to be well understood, making them
quite valuable in exploring the relationship between faintness and farness
[21]  in the distant universe.

                      Tomorrow's picture: meteor mountain

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    Authors & editors: Robert Nemiroff [33] (MTU [34] ) & Jerry Bonnell [35]
                                  (UMCP [36] )
          NASA Official:  Phillip Newman Specific rights apply [37] .
              NASA Web Privacy Policy and Important Notices [38]
              A service of: ASD [39]  at NASA [40]  / GSFC [41]
                           & Michigan Tech. U. [42]
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Site notes:
  [1] archivepix.html
  [2] image/1901/TychoSNR_Chandra_3600.jpg
  [3] http://www.nasa.gov/
  [4] http://chandra.harvard.edu/
  [5] http://arxiv.org/abs/1102.3829
  [6] https://en.wikipedia.org/wiki/Tycho%27s_Supernova
  [7] http://galileo.rice.edu/sci/brahe.html
  [8] http://chandra.harvard.edu/photo/2011/tycho2/
  [9] https://science.nasa.gov/ems/11_xrays
  [10] http://chandra.harvard.edu/about/
  [11] http://chandra.si.edu/photo/2016/tycho/tycho_BU_lg_web.mov
  [12] https://www.youtube.com/watch?v=Zr_DwYHaxx4
  [13] http://spider.seds.org/spider/Vars/sn1572.html
  [14] https://en.wikipedia.org/wiki/Tycho_G
  [15] https://arxiv.org/abs/1604.01779
  [16] http://www.solstation.com/x-objects/tycho-s.htm
  [17] http://www.youtube.com/watch?v=sTyMffjKTTo
  [18] https://en.wikipedia.org/wiki/Cosmic_distance_ladder
  [19] ap181007.html
  [20] http://en.wikipedia.org/wiki/Type_Ia_supernova
  [21] http://www-supernova.lbl.gov/PhysicsTodayArticle.pdf
  [22] ap190112.html
  [23] archivepix.html
  [24] lib/apsubmit2015.html
  [25] lib/aptree.html
  [26] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [27] calendar/allyears.html
  [28] /apod.rss
  [29] lib/edlinks.html
  [30] lib/about_apod.html
  [31] http://asterisk.apod.com/discuss_apod.php?date=190113
  [32] ap190114.html
  [33] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [34] http://www.phy.mtu.edu/
  [35] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [36] http://www.astro.umd.edu/
  [37] lib/about_apod.html#srapply
  [38] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [39] https://astrophysics.gsfc.nasa.gov/
  [40] https://www.nasa.gov/
  [41] https://www.nasa.gov/centers/goddard/
  [42] http://www.mtu.edu/
