The Mysterious "Space Roar"

We here at SciShow like to start things off with a "Boom" for yet another season! Hank talks about the mystery behind the "Space Roar" and why it is we can't really hear it.

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Sources:
http://www.howstuffworks.com/humans-hear-in-space.htm
http://io9.com/5986849/what-is-space-roar
http://physicsdatabase.com/2013/03/16/the-great-unsolved-problems-in-physics-the-space-roar/
http://www.space.com/6293-mystery-roar-faraway-space-detected.html
http://prezi.com/78dbpnjnazkn/space-roar/ - clips of space sounds
http://www.spacetoday.org/Questions/StarlightAge.html
http://www.nasa.gov/centers/goddard/news/topstory/2009/arcade_balloon.html
http://www.howitworksdaily.com/science/why-do-radio-waves-travel-at-the-speed-of-light-and-not-sound/
http://www.nature.com/news/kepler-s-surprise-the-sounds-of-the-stars-1.9724
http://www.popularmechanics.com/how-to/blog/what-created-these-mystery-radio-waves-from-another-galaxy-15657576
http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html