Adler Planetarium Astronomer Mark Hammergren joins John Williams to discuss a Harvard professor’s theory that a piece of space debris originated from a civilization that’s out of this world. He shares one quality that could be most telling about this mystery object, and why aliens are a bad explanation for it.[audio http://serve.castfire.com/audio/3593863/adler-planetarium-astronomer-mark-hammergren-on-aliens-and-space-debris_2019-02-07-162803.64kmono.mp3]
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