                  APOD: 2018 June 12 - Star Size Comparison 2

                         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.

                                 2018 June 12
                            Star Size Comparison 2
 Video Credit: morn1415 [2]  (YouTube); Images Credit:  NASA [3]  (typically);
                      Music:  Alpha [4] (Vangelis [5] )

Explanation: How big is our Sun compared to other stars? In dramatic and
popular video [6] s featured on YouTube [7] , the relative sizes of planets,
stars, and even the universe are shown from smallest to largest. The featured
video [8]  begins with Earth's Moon [9] and progresses through increasingly
larger moons and planets in our Solar System [10] . Soon, the Sun [11]  is
shown and compared to many of the brighter stars in our neighborhood of the
Milky Way Galaxy [12] . Finally, star sizes are shown in comparison with the
Milky Way Galaxy [13] , galaxies across the observable universe [14] , and
speculatively, regions of a potentially greater [15] multiverse [16] . Note
that the true sizes of most stars outside of the Sun and Betelgeuse [17]  are
not known by direct observation, but rather inferred by measurements of their
perceived brightness [18] , temperature [19] , and distance. Although an
inspiring learning tool that is mostly accurate, APOD readers [20]  are
encouraged to complete the learning experience -- and possibly help make
future versions more accurate -- by pointing out slight inaccuracies [21]  in
the video.

                    Tomorrow's picture: red cloudbow [22]

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    Authors & editors: Robert Nemiroff [34] (MTU [35] ) & Jerry Bonnell [36]
                                  (UMCP [37] )
          NASA Official:  Phillip Newman Specific rights apply [38] .
              NASA Web Privacy Policy and Important Notices [39]
              A service of: ASD [40]  at NASA [41]  / GSFC [42]
                           & Michigan Tech. U. [43]
----------
Site notes:
  [1] archivepix.html
  [2] https://www.youtube.com/user/morn1415
  [3] https://www.nasa.gov/
  [4] https://www.youtube.com/watch?v=3kK_HGNOo9A
  [5] https://en.wikipedia.org/wiki/Vangelis
  [6] https://www.youtube.com/watch?v=GoW8Tf7hTGA
  [7] http://en.wikipedia.org/wiki/YouTube
  [8] https://www.youtube.com/watch?v=GoW8Tf7hTGA
  [9] ap180318.html
  [10] http://science.nationalgeographic.com/science/space/solar-system
  [11] https://solarsystem.nasa.gov/solar-system/sun/in-depth/
  [12] http://www.atlasoftheuniverse.com/galaxy.html
  [13] https://solarsystem.nasa.gov/resources/285/the-milky-way-galaxy/
  [14] ap180508.html
  [15] ap010101.html
  [16] http://asterisk.apod.com/viewtopic.php?f=39&t=21958
  [17] ap100106.html
  [18] http://en.wikipedia.org/wiki/Luminosity
  [19] http://www.youtube.com/watch?v=s9eE2jFoioM
  [20]
http://www.glassesfree3dtv.com/wp-content/uploads/2010/02/
3d-tv-without-glasses.jpg
  [21] http://asterisk.apod.com/discuss_apod.php?date=180612
  [22] ap180613.html
  [23] ap180611.html
  [24] archivepix.html
  [25] lib/apsubmit2015.html
  [26] lib/aptree.html
  [27] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [28] calendar/allyears.html
  [29] /apod.rss
  [30] lib/edlinks.html
  [31] lib/about_apod.html
  [32] http://asterisk.apod.com/discuss_apod.php?date=180612
  [33] ap180613.html
  [34] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [35] http://www.phy.mtu.edu/
  [36] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [37] http://www.astro.umd.edu/
  [38] lib/about_apod.html#srapply
  [39] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [40] https://astrophysics.gsfc.nasa.gov/
  [41] https://www.nasa.gov/
  [42] https://www.nasa.gov/centers/goddard/
  [43] http://www.mtu.edu/
