Video: New Horizons animation

The icy plains of Pluto resolved by NASA’s New Horizons spacecraft stretch as wide as Texas, enveloping mountain ranges and bizarre hilly outcrops in a mosaic revealing one lobe of the distant world’s heart-shaped reservoir of exotic frozen carbon monoxide, nitrogen and methane.

NASA’s New Horizons probe, now just 10 million miles from Pluto and 14 days from a historic July 14 flyby, is operating in near flawless fashion, making increasingly detailed observations of the enigmatic dwarf planet and its large moon Charon, project engineers and scientists reported Tuesday.

Scientists believe they can explain how an ocean of water is lurking beneath an ice sheet inside Pluto’s prominent heart-shaped region, an iconic frozen landscape discovered during the New Horizons spacecraft’s flyby last year.