What Is the Search for a Ninth Planet in Our Solar System?
TL;DR
Astronomers believe a distant, massive planet, dubbed Planet Nine, exists beyond Neptune, influencing the orbits of icy bodies in the outer solar system. Currently estimated to be six times the mass of Earth and located about 15 times farther from the Sun than Neptune, Planet Nine remains elusive due to its faintness and the vastness of space, but researchers are optimistic about finding it using existing data.
Transcript
I'm going to tell you a story from 200 years ago. In 1820, French astronomer Alexis Bouvard almost became the second person in human history to discover a planet. He'd been tracking the position of Uranus across the night sky using old star catalogs, and it didn't quite go around the Sun the way that his predictions said it should. Sometimes it was... Read More
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