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.

                                2018 December 1
                                      [2]
                          Mount Everest Star Trails
            Image Credit & Copyright [3] : Jeff Dai [4] (TWAN [5] )

Explanation: The highest [6]  peak on planet Earth [7] is framed in this
mountain and night skyscape. On September 30, the digital stack of 240
sequential exposures made with a camera fixed to a tripod at an Everest Base
Camp [8]  captured the sheer north face [9] of the Himalayan mountain and
foreground illuminated by bright moonlight. Taken over 1.5 hours, the sequence
also recorded colorful star trails. Reflecting the planet's daily rotation on
its axis, their motion is along gentle concentric arcs centered on the south
celestial pole [10] , a point well below the rugged horizon. The color [11] of
the trails actually indicates the temperatures of the stars. Blueish hues are
from hotter stars, and yellow to reddish hues are from stars cooler than the
Sun.

                      Tomorrow's picture: big star pillar

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    Authors & editors: Robert Nemiroff [23] (MTU [24] ) & Jerry Bonnell [25]
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Site notes:
  [1] archivepix.html
  [2] image/1812/EverestStarTrailsJeffDai.jpg
  [3] lib/about_apod.html#srapply
  [4] http://www.twanight.org/Dai
  [5] http://www.twanight.org/
  [6] ap160225.html
  [7] https://www.earthobservatory.nasa.gov/ features/8000MeterPeaks
  [8] https://en.wikipedia.org/wiki/ Everest_Base_Camp
  [9] https://en.wikipedia.org/wiki/ Mount_Everest#North_ridge_route
  [10] ap120802.html
  [11] ap151224.html
  [12] ap181130.html
  [13] archivepix.html
  [14] lib/apsubmit2015.html
  [15] lib/aptree.html
  [16] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [17] calendar/allyears.html
  [18] /apod.rss
  [19] lib/edlinks.html
  [20] lib/about_apod.html
  [21] http://asterisk.apod.com/discuss_apod.php?date=181201
  [22] ap181202.html
  [23] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [24] http://www.phy.mtu.edu/
  [25] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [26] http://www.astro.umd.edu/
  [27] lib/about_apod.html#srapply
  [28] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [29] https://astrophysics.gsfc.nasa.gov/
  [30] https://www.nasa.gov/
  [31] https://www.nasa.gov/centers/goddard/
  [32] http://www.mtu.edu/

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