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 September 4
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                        The Spider Nebula in Infrared
     Image Credit: [3]NASA, [4]JPL-Caltech, [5]Spitzer Space Telescope,
                                  [6]2MASS

   Explanation: Will the spider ever catch the fly? Not if both are large
   [7]emission nebulas toward the constellation of the Charioteer
   ([8]Auriga). The [9]spider-shaped gas cloud on the left is actually an
   emission nebula labelled [10]IC 417, while the smaller fly-shaped cloud
   on the right is dubbed [11]NGC 1931 and is both an emission nebula and
   a [12]reflection nebula. About 10,000 [13]light-years distant, both
   nebulas harbor young, open [14]star clusters. For scale, the more
   compact [15]NGC 1931 (Fly) is about 10 light-years across. The
   [16]featured picture in scientifically-assigned, [17]infrared colors
   combines images from the [18]Spitzer Space Telescope and the [19]Two
   Micron All Sky Survey (2MASS). [20]Spitzer is celebrating its 16th year
   orbiting the Sun near the [21]Earth.

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                       Tomorrow's picture: open space
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    Authors & editors: [55]Robert Nemiroff ([56]MTU) & [57]Jerry Bonnell
                                 ([58]UMCP)
          NASA Official: Phillip Newman [59]Specific rights apply.
              [60]NASA Web Privacy Policy and Important Notices
                A service of: [61]ASD at [62]NASA / [63]GSFC
                           & [64]Michigan Tech. U.

References

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   2. https://apod.nasa.gov/apod/image/1909/SpiderFly_Spitzer2Mass_4165.jpg
   3. https://www.nasa.gov/
   4. https://www.jpl.nasa.gov/
   5. http://www.spitzer.caltech.edu/
   6. https://old.ipac.caltech.edu/2mass/
   7. https://apod.nasa.gov/apod/emission_nebulae.html
   8. https://en.wikipedia.org/wiki/Auriga_(constellation)
   9. https://en.wikipedia.org/wiki/The_Spider_and_the_Fly_(poem)
  10. https://www.noao.edu/image_gallery/html/im1166.html
  11. https://en.wikipedia.org/wiki/NGC_1931
  12. https://apod.nasa.gov/apod/reflection_nebulae.html
  13. https://www.grc.nasa.gov/www/k-12/Numbers/Math/Mathematical_Thinking/how_long_is_a_light_year.htm
  14. http://asterisk.apod.com/viewtopic.php?f=24&t=18009
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  16. https://photojournal.jpl.nasa.gov/catalog/PIA20357
  17. https://science.nasa.gov/ems/07_infraredwaves
  18. http://www.spitzer.caltech.edu/mission/32-The-Mission
  19. https://apod.nasa.gov/apod/ap100530.html
  20. http://www.spitzer.caltech.edu/news/2195-ssc2019-15-Sixteen-Images-for-Spitzer-s-Sweet-16
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  55. http://www.phy.mtu.edu/faculty/Nemiroff.html
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