ScienceDaily
A smashed-up asteroid sent space rubble raining down on Earth, the Moon, and Mars 800 million years ago - possibly cooling the planet and shaking things up in ways that make the Chicxulub impact look like a fender bender.
ScienceDaily
New study warns that methane from spacecraft exhaust could spread across the moon in days, contaminating ancient ice that might hold the chemical keys to how life on Earth began.
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