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.

                                 2021 May 19
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                           The Jellyfish and Mars
                Image Credit & [3]Copyright: [4]Jason Guenzel

   Explanation: Normally faint and elusive, the Jellyfish Nebula is caught
   in [5]this alluring scene. In the telescopic field of view two bright
   yellowish stars, [6]Mu and [7]Eta Geminorum, stand just below and above
   the Jellyfish Nebula at the left. Cool red giants, they lie at the foot
   of the [8]celestial twin. The Jellyfish Nebula itself floats below and
   left of center, a bright arcing ridge of emission with dangling
   tentacles. In fact, the cosmic jellyfish is part of bubble-shaped
   [9]supernova remnant IC 443, the expanding debris cloud from a
   [10]massive star that exploded. Light from that explosion first reached
   planet Earth over 30,000 years ago. Like its cousin in
   [11]astrophysical waters the [12]Crab Nebula supernova remnant, the
   Jellyfish Nebula is [13]known to harbor a neutron star, the remnant of
   the collapsed stellar core. Composed on April 30, this telescopic
   snapshot also captures Mars. [14]Now wandering through early evening
   skies, the Red Planet also shines with a yellowish glow on the right
   hand side of the field of view. Of course, the Jellyfish Nebula is
   about 5,000 light-years away, while [15]Mars is currently almost 18
   light-minutes from Earth.

                     Tomorrow's picture: pixels in space
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    Authors & editors: [27]Robert Nemiroff ([28]MTU) & [29]Jerry Bonnell
                                 ([30]UMCP)
          NASA Official: Phillip Newman [31]Specific rights apply.
              [32]NASA Web Privacy Policy and Important Notices
                A service of: [33]ASD at [34]NASA / [35]GSFC
                           & [36]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2105/Guenzel-JellyfishMars30APR2021.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.facebook.com/TheVastReaches
   5. https://twitter.com/TheVastReaches/status/1390351755465084930
   6. http://stars.astro.illinois.edu/sow/tejat.html
   7. http://stars.astro.illinois.edu/sow/propus.html
   8. http://www.hawastsoc.org/deepsky/gem/index.html
   9. https://apod.nasa.gov/apod/ap060602.html
  10. http://chandra.harvard.edu/xray_sources/supernovas.html
  11. http://arxiv.org/abs/1002.2198
  12. https://apod.nasa.gov/apod/ap180317.html
  13. http://chandra.harvard.edu/photo/2000/1083/index.html
  14. https://earthsky.org/astronomy-essentials/why-is-mars-sometimes-bright-and-sometimes-faint
  15. https://www.nasa.gov/feature/jpl/perseverance-s-robotic-arm-starts-conducting-science
  16. https://apod.nasa.gov/apod/ap210518.html
  17. https://apod.nasa.gov/apod/archivepix.html
  18. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  19. https://apod.nasa.gov/apod/lib/aptree.html
  20. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  21. https://apod.nasa.gov/apod/calendar/allyears.html
  22. https://apod.nasa.gov/apod.rss
  23. https://apod.nasa.gov/apod/lib/edlinks.html
  24. https://apod.nasa.gov/apod/lib/about_apod.html
  25. http://asterisk.apod.com/discuss_apod.php?date=210519
  26. https://apod.nasa.gov/apod/ap210520.html
  27. http://www.phy.mtu.edu/faculty/Nemiroff.html
  28. http://www.phy.mtu.edu/
  29. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  30. http://www.astro.umd.edu/
  31. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  32. https://www.nasa.gov/about/highlights/HP_Privacy.html
  33. https://astrophysics.gsfc.nasa.gov/
  34. https://www.nasa.gov/
  35. https://www.nasa.gov/centers/goddard/
  36. http://www.mtu.edu/