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 www.nasa.gov/images/content/681727main_kepler47_art_full.jpg [credit: NASA/JPL-Caltech/T. Pyle]
Exoplanet, Earth-like - Artist’s Impression www.gemini.edu/images/pio/News/2014/pr2014_03/AAAS/quintana4HR.jpg [credit: NASA Ames/SETI Institute/JPL-CalTech]
James Webb Space Telescope 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 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 svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=20220 [credit: NASA's Goddard Space Flight Center Conceptual Image Lab]
Wedding Lanterns www.flickr.com/photos/jirka_matousek/12431704084 [credit: Jirka Matousek]
Balloon en.wikipedia.org/wiki/Project_Echo#/media/File:Echo_II.jpg [credit: NASA]
Naked-eye Venus photo taken by Phil Plait
Cygnus Reentry www.flickr.com/photos/astro_alex/14760660030/in/set-72157645670772466/ [credit: ESA/NASA]
Moon www.eso.org/public/archives/images/large/potw1023a.jpg [credit: G. Gillet/ESO]
Progress M-10M reentry plasma trail commons.wikimedia.org/wiki/File:Progress_M-10M_reentry_plasma_trail.jpg [credit: NASA]
Alien Worlds 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 www.youtube.com/watch?v=RqX9vLj3_7w [credit: NRAO]
Barred spiral bares all www.spacetelescope.org/images/potw1035a/ [credit: ESA/Hubble & NASA]
Hi hello www.flickr.com/photos/bencanales/8745890764/sizes/l [credit: Ben Canales, www.thestartrail.com/]

1. Introduction to Astronomy
2. Naked Eye Observations
3. Cycles in the Sky
4. Moon Phases
5. Eclipses
6. Telescopes
7. The Gravity of the Situation
8. Tides
9. Introduction to the Solar System
10. The Sun
11. The Earth
12. The Moon
13. Mercury
14. Venus
15. Mars
16. Jupiter
17. Jupiter's Moons
18. Saturn
19. Uranus & Neptune
20. Asteroids
21. Comets
22. The Oort Cloud
23. Meteors
24. Light
25. Distances
26. Stars
27. Exoplanets
28. Brown Dwarfs
29. Low Mass Stars
30. White Dwarfs & Planetary Nebulae
31. High Mass Stars
32. Neutron Stars
33. Black Holes
34. Binary and Multiple Stars
35. Star Clusters
36. Nebulae
37. The Milky Way
38. Galaxies, part 1
39. Galaxies, part 2
40. Gamma-Ray Bursts
41. Dark Matter
42. The Big Bang, Cosmology part 1
43. Dark Energy, Cosmology part 2
44. A Brief History of the Universe
45. Deep Time
46. Everything, The Universe...And Life
47. Explore The Solar System:

In this Crash Course series, marvel at the wonders of astronomy with your host for this intergalactic adventure, the Bad Astronomer himself -- Phil Plait. In just 40 short lessons, you will learn the basics of the oldest science known to humanity.

Be sure to check out links to relevant Photos in the description for each video.