rilles

Astronauts on the Apollo 17 mission discovered orange glass that conclusively proved the Moon had once been volcanic, and there are also narrow lunar gullies called rilles that could only have been formed by flowing lava.

"MAIN" via Steve in Google Reader 2010

Previous signs of such tunnels only existed as surface features called rilles, which hinted at hollow lava tubes below.

The Hindu - Front Page 2009

Take a telescopic look at the rilles adorning this lunar desert, whose surface is the size of Italy.

Weekend SkyWatcher's Forecast – January 22-24, 2010 | Universe Today 2010

Lunokhod 2 covered a whopping 37 km 23 miles of terrain, including hilly upland areas and rilles.

Did You Know: Russian Lunokhod Rovers Created Memorials on the Moon Honoring Women | Universe Today 2010

Sinuous rilles are thought to be formed by flowing lava, either on the surface or in enclosed lava tubes.

Kaguya Discovers a Lava Tube on the Moon | Universe Today 2009

Electrical discharges in the form of megalightning and caused by electrical discharge machining, is responsible for many planetary features including arachnoids, chaos terrain, craters, Martian spiders, and rilles.

Electric universe Cliff Pickover 2007

Electrical discharges in the form of megalightning and caused by electrical discharge machining, is responsible for many planetary features including arachnoids, chaos terrain, craters, Martian spiders, and rilles.

Archive 2007-01-01 Cliff Pickover 2007

The rilles are old fissures where gas from below ground had seeped out.

Moonwar Bova, Ben, 1932- 1997

The ground was cracked with rilles, pockmarked with small craters and strewn with rocks, but there were plenty of open spaces where a good pilot could make a landing.

Moonwar Bova, Ben, 1932- 1997

For a long time, a third of a revolution, there was nothing but the irregular pocks and rilles of the ocean basin.

DEEP DOMAIN Howard Weinstein 1987