Learn more about the water molecules on the moon, which may trace their origins to the materials that made Earth and comets.

Mars has two moons, Phobos and Deimos. Scientists still debate whether these came from asteroids that passed close into Mars' ...

Tracing the path of recycling in Whatcom County is a multipart series that follows waste from curbside to commodity market.

He dreaded the approach of human beings and the loud reports of the weapons they carried; and so while eager to slink away if ...