For 10 points, name this dwarf planet that forms a binary system with its moon Charon.
This object's Sputnik Planum contains evidence of recent geological activity. This object's color is theorized to be a result of tholins created from lyman-alpha rays interacting with methane. The Tombaugh Regio on this body has received much acclaim for its resemblance to a (*) heart. Percival Lowell initiated the search for this object referring to it as Planet X. This object was visited by the New Horizon space probe in July of 2015. For 10 points, name this dwarf planet that forms a binary system with its moon Charon.
This object's Sputnik Planum contains evidence of recent geological activity.
Pluto