Here it is, folks: the end. In our final episode of Crash Course Astronomy, Phil gives the course a sendoff 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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Watching in 2021 or later? Learn about the James Webb Space Telescope's long journey to launch here:    • Why It Took a Decade to Launch The Ja...  

Want to learn more about some of the strangest planets in the universe? Check out this video from our sister channel, SciShow Space:    • The Strangest Planets in the Universe...  

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Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crash...
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Chapters:
Introduction: Are We Alone in the Universe? 00:00
The Search for Earth-like Exoplanets 1:14
Is There Alien Life in the Universe? 4:43
SETI: The Search for Extraterrestrial Intelligence 6:16
Let's Explore the Universe! 8:29
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PHOTOS/VIDEOS
Exoplanet, thick atmosphere - Artist’s Impression http://www.nasa.gov/images/content/68... [credit: NASA/JPL-Caltech/T. Pyle]
Exoplanet, Earth-like - Artist’s Impression http://www.gemini.edu/images/pio/News... [credit: NASA Ames/SETI Institute/JPL-CalTech]
James Webb Space Telescope http://www.stsci.edu/~levay/presres/j... [credit: Northrop Grumman Space Technology]
Hubble's High-Definition Panoramic View of the Andromeda Galaxy http://hubblesite.org/newscenter/arch... [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/deta... [credit: NASA's Goddard Space Flight Center Conceptual Image Lab]
Wedding Lanterns https://www.flickr.com/photos/jirka_m... [credit: Jirka Matousek]
Balloon https://en.wikipedia.org/wiki/Project... [credit: NASA]
Naked-eye Venus photo taken by Phil Plait
Cygnus Reentry https://www.flickr.com/photos/astro_a... [credit: ESA/NASA]
Moon http://www.eso.org/public/archives/im... [credit: G. Gillet/ESO]
Progress M-10M reentry plasma trail https://commons.wikimedia.org/wiki/Fi... [credit: NASA]
Alien Worlds https://www.cfa.harvard.edu/sites/www... [credit: David Aguilar / CfA]
Beyond the Visible: The Story of the Very Large Array    • Beyond the Visible: The Story of the ...   [credit: NRAO]
Barred spiral bares all http://www.spacetelescope.org/images/... [credit: ESA/Hubble & NASA]
Hi hello https://www.flickr.com/photos/bencana... [credit: Ben Canales, http://www.thestartrail.com/]