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                        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.

                                2020 April 28
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                       The Kepler-90 Planetary System
              Illustration Credit: [3]NASA Ames, Wendy Stenzel

   Explanation: Do other stars have [4]planetary systems like our own? Yes
   -- one such system is [5]Kepler-90. Cataloged by the [6]Kepler
   satellite that operated from Earth orbit between 2009 and 2018,
   [7]eight planets were discovered, giving Kepler-90 the same number of
   known planets as our [8]Solar System. Similarities between Kepler-90
   and our system include a [9]G-type star comparable to our Sun, rocky
   planets comparable to our Earth, and large planets comparable in size
   to [10]Jupiter and [11]Saturn. Differences include that all of the
   known [12]Kepler-90 planets orbit relatively close in -- closer than
   Earth's orbit around the Sun -- making them possibly too hot to
   [13]harbor life. However, observations over longer time periods may
   discover [14]cooler planets further out. [15]Kepler-90 lies about 2,500
   light years away, and at magnitude 14 is visible with a medium-sized
   telescope toward the constellation of the Dragon ([16]Draco). The
   [17]exoplanet-finding mission [18]TESS was launched in 2018, while
   missions with exoplanet finding capability planned for launch in the
   next decade include NASA's [19]JWST and [20]WFIRST.

    Experts Debate: [21]How will humanity first discover extraterrestrial
                                    life?
                       Tomorrow's picture: open space
     __________________________________________________________________

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    Authors & editors: [33]Robert Nemiroff ([34]MTU) & [35]Jerry Bonnell
                                 ([36]UMCP)
          NASA Official: Phillip Newman [37]Specific rights apply.
              [38]NASA Web Privacy Policy and Important Notices
                A service of: [39]ASD at [40]NASA / [41]GSFC
                           & [42]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2004/Kepler90Illustration_Kepler_1820.jpg
   3. https://www.nasa.gov/ames
   4. https://apod.nasa.gov/debate/debate100th.html
   5. https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA22193
   6. https://www.nasa.gov/mission_pages/kepler/spacecraft/index.html
   7. https://www.jpl.nasa.gov/news/news.php?release=2017-321
   8. https://solarsystem.nasa.gov/solar-system/our-solar-system/overview/
   9. https://en.wikipedia.org/wiki/G-type_main-sequence_star
  10. https://apod.nasa.gov/apod/ap170523.html
  11. https://apod.nasa.gov/apod/ap200419.html
  12. https://www.youtube.com/watch?v=0uzv-tEa7SI
  13. https://apod.nasa.gov/debate/debate100th.html
  14. https://2.bp.blogspot.com/-4WbbTXMQyrc/TYrKOKNZZBI/AAAAAAACB50/wqhFnRgAIIo/s400/boo_Pomeranian_Dog_19.jpg
  15. https://en.wikipedia.org/wiki/Kepler-90
  16. https://en.wikipedia.org/wiki/Draco_(constellation)
  17. http://www.searchforlife.net/exoplanet-missions/
  18. https://tess.gsfc.nasa.gov/
  19. https://apod.nasa.gov/apod/ap160509.html
  20. https://wfirst.gsfc.nasa.gov/
  21. https://apod.nasa.gov/debate/debate100th.html
  22. https://apod.nasa.gov/apod/ap200427.html
  23. https://apod.nasa.gov/apod/archivepix.html
  24. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  25. https://apod.nasa.gov/apod/lib/aptree.html
  26. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  27. https://apod.nasa.gov/apod/calendar/allyears.html
  28. https://apod.nasa.gov/apod.rss
  29. https://apod.nasa.gov/apod/lib/edlinks.html
  30. https://apod.nasa.gov/apod/lib/about_apod.html
  31. http://asterisk.apod.com/discuss_apod.php?date=200428
  32. https://apod.nasa.gov/apod/ap200429.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. https://apod.nasa.gov/apod/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/