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.--- Send in a voice message: https://anchor.fm/the-cosmic-companion/messageSupport this podcast: https://anchor.fm/the-cosmic-companion/support Get full access to The Cosmic Companion at thecosmiccompanion.substack.com/subscribe