Two huge masses deep within Earth may have remained ... back at least half a billion years and possibly even to the formation of the planet more than 4 billion years ago, says Deuss.

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 ...

The meteorite was identified as billions of years ... formed in stars before the Sun and Earth came into existence. These grains, including micro-diamonds and silicon carbide, date back over 4.6 ...