In today's Crash Course Astronomy, Phil takes a look at the explosive history of our cosmic backyard. We explore how we went from a giant ball of gas to the system of planets and other celestial objects we have today.

This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourse

Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crash...

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Chapters:
Introduction 00:00
Geocentrism vs Heliocentrism 0:51
Makeup of the Solar System 2:38
Is Pluto a Planet? 3:14
Our Solar System 4:24
How Our Solar System Formed 5:36
Planet Formation Depends on Distance to Sun 7:14
Review 8:57

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PHOTO/VIDEO CREDITS
Sun: http://www.nasa.gov/sites/default/fil... [credit: NASA/ESA]
Jupiter: http://www.jpl.nasa.gov/images/hubble... [credit: NASA/ESA]
Geocentric celestial spheres; Peter Apian's Cosmographia (Antwerp, 1539): http://en.wikipedia.org/wiki/Celestia...
Ganymede: http://en.wikipedia.org/wiki/File:Noa...
Mercury: http://messenger.jhuapl.edu/gallery/s... [credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington]
Understanding Solar System Dynamics: Orbits and Kepler's Laws (2008): https://archive.org/details/OrbitsAnd...
Mercury: http://apod.nasa.gov/apod/ap080116.html
Venus: http://www.msss.com/all_projects/mage...
Earth: http://earthobservatory.nasa.gov/IOTD...
Mars: http://nssdc.gsfc.nasa.gov/photo_gall...
Jupiter: http://www.nasa.gov/mission_pages/cas...
Saturn: http://www.slate.com/content/dam/slat... [credit: Photo by NASA/JPL/Space Science Institute/Gordan Ugarkovic]
Uranus: http://hubblesite.org/newscenter/arch...
Neptune: http://www.slate.com/blogs/bad_astron...
http://www.nasa.gov/sites/default/fil... [credit: JHUAPL/SwRI/Dan Durda]
Bennu’s Journey: http://svs.gsfc.nasa.gov/cgi-bin/deta...
http://svs.gsfc.nasa.gov/cgi-bin/deta...
Artist's impression of a protoplanetary disk: http://en.wikipedia.org/wiki/Protopla...
Rocky Ring of Debris Around Vega: http://www.nasa.gov/mission_pages/spi... [image credit: NASA/JPL-Caltech]
Proplyds in the Orion Nebula: http://www.esa.int/Our_Activities/Spa...