Here it is, folks: the end. In our final episode of Crash Course Astronomy, Phil gives the course a send off with a look at some of his favorite topics and the big questions that Astronomy allows us to ask.

Thank you for watching.

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PHOTOS/VIDEOS
Exoplanet, thick atmosphere - Artist’s Impression http://www.nasa.gov/images/content/681727main_kepler47_art_full.jpg [credit: NASA/JPL-Caltech/T. Pyle]
Exoplanet, Earth-like - Artist’s Impression http://www.gemini.edu/images/pio/News/2014/pr2014_03/AAAS/quintana4HR.jpg [credit: NASA Ames/SETI Institute/JPL-CalTech]
James Webb Space Telescope http://www.stsci.edu/~levay/presres/jwst/jwst05_new-config.jpg [credit: Northrop Grumman Space Technology]
Hubble's High-Definition Panoramic View of the Andromeda Galaxy http://hubblesite.org/newscenter/archive/releases/2015/02/ [credit: NASA, ESA, J. Dalcanton, B.F. Williams, and L.C. Johnson (University of Washington), the PHAT team, and R. Gendler]
Bennu's Journey http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=20220 [credit: NASA's Goddard Space Flight Center Conceptual Image Lab]
Wedding Lanterns https://www.flickr.com/photos/jirka_matousek/12431704084 [credit: Jirka Matousek]
Balloon https://en.wikipedia.org/wiki/Project_Echo#/media/File:Echo_II.jpg [credit: NASA]
Naked-eye Venus photo taken by Phil Plait
Cygnus Reentry https://www.flickr.com/photos/astro_alex/14760660030/in/set-72157645670772466/ [credit: ESA/NASA]
Moon http://www.eso.org/public/archives/images/large/potw1023a.jpg [credit: G. Gillet/ESO]
Progress M-10M reentry plasma trail https://commons.wikimedia.org/wiki/File:Progress_M-10M_reentry_plasma_trail.jpg [credit: NASA]
Alien Worlds https://www.cfa.harvard.edu/sites/www.cfa.harvard.edu/files/images/pr/2011-30/1/hires.jpg [credit: David Aguilar / CfA]
Beyond the Visible: The Story of the Very Large Array https://www.youtube.com/watch?v=RqX9vLj3_7w [credit: NRAO]
Barred spiral bares all http://www.spacetelescope.org/images/potw1035a/ [credit: ESA/Hubble & NASA]
Hi hello https://www.flickr.com/photos/bencanales/8745890764/sizes/l [credit: Ben Canales, http://www.thestartrail.com/]