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Pluto's icy surface conceals vast ocean?

PLUTO may have a vast ocean beneath its frozen crust, according to researchers studying a heart-shaped feature on the dwarf planet’s surface.
Captured in high resolution by the New Horizon’s spacecraft in 2015, the bright, heart-shaped expanse is known as Tombaugh Regio, the left lobe of which is formed by the 1,000-kilometer wide Sputnik Planitia.
This plain is thought to have arisen after a meteorite slammed into Pluto’s surface billions of years ago, producing a crater that later filled with nitrogen ice.
But scientists have been puzzled as to why Sputnik Planitia lies near Pluto’s equator and faces almost…