For the next 500 million years the young Earth continued to be pelted relentlessly by comets, 5,、 meteorites, and other galactic debris, .
It's intending to do that in the latter half of next year, and hopefully by 2018 we'll start to see just how effective human-created meteorites really are.
They believe the nitrates are ancient and probably came from meteorites or lightning strikes.
Giant meteorites from outer space, fire storms, tidal waves and an ice age have all been suggested by expects to explain the demise of dinosaurs.
The scientists had performed similar analyses on Earth rocks and on meteorites, so they decided to duplicate the research on the lunar samples.
