So, even if the ocean of lava didn't cover the entirety of the Moon, it's likely there was at least a lake of molten rock on the lunar surface at some point or another, but it cooled and ...

These underground tunnels are produced by lava that formerly flowed across the Moon’s surface. The outer layer cooled and formed first, functioning as a shell. Meanwhile, the molten rock within ...

The floor is like cobblestone because of rock that is half melted ... created similarly to those suspected on the moon, the team hypothesized. Lava tubes on Earth are most commonly formed ...

The Moon's surface is pockmarked with more than ... by the geologic history that may be preserved inside this lava tube within rocks shielded from weathering and alteration by the solar wind ...

Tiny, orange glass beads discovered on the moon during the Apollo era may reveal an untold history of lunar volcanism.

No one expected these glittering bits among the gray lunar dust back then. The beads, smaller than grains of sand, formed ...

The Moon’s surface presents ... below the surface, assuming a rock density similar to that of the returned Apollo samples. These suspected lava tubes remain hidden beneath the surface, but ...

Giant pools of lava filled impact craters and settled into ... While about 850 pounds of Moon rock and soil have now been brought back to Earth, it has all been from just a handful of sites.

Most of the pits seem to be located in the moon’s ancient lava plains, according to the ... the team said. Rocks and other material inside these caves — unaltered by the harsh surface ...

These rings indicate something about the internal dynamics of the moon: Since the lava doesn't appear to extend past the edge of the lake, this implies that the melted rock is recycled regularly ...