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Adler Planetarium Astronomer Mark Hammergren: There’s a code of silence among astronomers that protects personal character

Jen DeSalvo, Mark Hammergren and John Williams are earthlings who wear earth tones. Get it? (Elif Geris/WGN Radio)

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.

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