Alva Review-Courier -

CAPE CANAVERAL, Fla. (AP) — Scientists have discovered dunes on Pluto made of tiny frozen grains of methane.

The pale gray and white ridges were revealed by NASA's New Horizons spacecraft during its 2015 flyby. A British-led team announced the findings Thursday in the journal Science.

Researchers said the dunes appear to be made mostly of icy specks of methane the size of sand, with some frozen nitrogen likely mixed in. Thought to be relatively recent, the parallel rows of dunes are located in Pluto's heart-shaped region at the base of mountains as tall as the Alps and formed from giant blocks...