The team made the discovery by measuring the speed at which our galaxy is moving through space.

VOA: special.2009.01.20

The hydrogen sulfide reacted with oxygen in rainwater moving through the rock.

VOA: special.2011.04.11

Water in the sand between the two pots evaporates through the surface of the larger pot, where drier outside air is moving.

VOA: special.2009.02.09