Matthew Bothwell, author of The Invisible Universe, discusses the 93% of "ordinary" matter we cannot see with the human eye - radio, infrared, ultraviolet astronomy, and more...    

This week on Astronomy News with the Cosmic Companion, we also look at how machine learning recently discovered hundreds of unknown planets, we explore a massive world hotter than some stars, and Dart lifts off on a mission that could help us save the planet.

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