WASHINGTON June 1; Scientists have detected another exotic feature on one of the solar system’s most wondrous worlds, a large field of dunes on the surface of the distant, frigid dwarf planet Pluto apparently composed of wind-swept, sand-sized grains of frozen methane.
The dunes, spotted on images taken by NASA’s New Horizons spacecraft during its 2015 flyby, sit at the boundary between a heart-shaped nitrogen glacier about the size of France called Sputnik Planitia and the Al Idrisi Montes mountain range made of frozen water, scientists said on Thursday.
The dunes cover about 775 square miles (2,000 square km), roughly the size of Tokyo. Their existence came as a surprise. There was some doubt about whether Pluto’s extremely thin atmosphere, mainly nitrogen with minor amounts of methane and carbon monoxide, could muster the wind needed to form such features.
