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

John Williams

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

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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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Focusing on current events, John discusses the news of the day, sports, television programs, movies, and books with a thoughtful perspective and quirky sense of humor. Inquisitive and curious by nature, he asks what listeners want to know and his guests never get a pass on the tough questions. (Click for more.)