The centuries-long hunt for the largest hidden object in the solar system

Everyone knows there are exactly eight planets in our solar system. But what if there were a ninth? Two scientists, separated by a century, are convinced it exists. They've spent their lives searching, but no one has seen it. Yet.

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Arizona ,United States ,University Of Arizona ,San Diego ,California ,Alabama ,Cambridge ,Cambridgeshire ,United Kingdom ,Death Valley ,Kevin Schindler ,Konstantin Batygin ,Mike Brown ,Renu Malhotra ,Percival Lowell ,Abbott Lawrence Lowell ,Boston Public Library ,Neptunian Objects ,Kuiper Belt ,Orbital Dynamics ,Trans Neptunian Objects ,