When American astronauts go back to the moon in the next few years, they'll be checking out two enormous canyons on the south pole, which researchers say were carved by an asteroid nearly four billion ...

An object between 2 and 50 times the mass of Jupiter may have flown through our solar system some 4 billion years ago and warped the orbits of many planets. More NASA, ESA, Caltech / ISTOCK ...

That means NASA's targeted exploration zone around the pole mostly on the moon's near side won't be buried under debris, keeping older rocks from 4 billion plus years ago exposed for collection by ...