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b'In astronomy, the rule of thumb was simple: If you can\\u2019t see it with a telescope, it\\u2019s not real.\\xa0Seeing is believing.\\xa0Well, tell that to the astronomers who discovered dark energy, or dark matter \\u2026 or, more recently, Planet 9.\\xa0\\xa0And yet we have evidence that all these things exist (although skepticism about the ninth \\u2013 or is it tenth? \\u2013 planet still lingers).\\nFind out how we know what we know about the latest cosmic discoveries \\u2013 even if we can\\u2019t see them directly.\\xa0The astronomer who found Planet 9 \\u2013 and killed Pluto \\u2013 offers his evidence.\\xa0\\nAnd, a speculative scenario suggests that dark matter helped do away with the dinosaurs.\\xa0\\nPlus, the winner of the 2015 Nobel Prize in Physics explains why neutrinos that are zipping through your body right now may hold clues to the origin of the universe.\\xa0\\nGuests:\\n\\n\\nMichael Brown - Astronomer, California Institute of Technology\\n\\n\\nMichael Lemonick - science writer and an editor at Scientific American magazine\\n\\n\\n Lisa Randall - Theoretical physicist, Harvard University, author of Dark Matter and the Dinosaurs: The Astounding Interconnectedness of the Universe\\n\\n\\n\\nArthur McDonald - Astrophysicist emeritus, Queen\\u2019s University, Kingston, Ontario, and winner of the 2015 Nobel Prize in Physics\\n\\n\\nLearn more about your ad choices. Visit megaphone.fm/adchoices'