The Pioneer 10 and 11 probes were launched to explore outer space, but in the 80s scientists discovered they were veering offcourse, and we had no idea why!

Host: Hank Green

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Sources:
http://www.nasa.gov/centers/ames/miss...
http://www.space.com/16648pioneeran...
http://www.popsci.com/pioneeranomaly'>http://www.popsci.com/pioneeranomaly
http://www.space.com/448problemgrav...
http://spectrum.ieee.org/aerospace/as...
http://www.space.com/448problemgrav...
http://arxiv.org/pdf/1204.2507v1.pdf
http://www.popsci.com/pioneeranomaly'>http://www.popsci.com/pioneeranomaly

Image Sources:
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Ca...
https://commons.wikimedia.org/wiki/Fi...
http://www.nasa.gov/centers/ames/imag...
http://solarsystem.jpl.nasa.gov/rps/d...