1905: Beyond Neptune
Percival Lowell launches a search for "Planet X." His calculations are based on inaccurate contemporary estimates of Uranus' mass, but his quest will eventually turn up a different world.
(Credit: Lowell Observatory)
A History of Pluto Exploration
As New Horizons' journey culminates in the July 14 Pluto flyby, explore how a search for Planet X over a century ago led scientists on a wild ride of dwarf planet discovery.
Jul 13, 2015 5:00 PMNov 13, 2019 5:41 PM
(Credit: NASA/APL/SwRI)
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