The Mars-sized object that hit baby Earth some 4.5 billion years ago, creating plumes of debris that eventually coalesced into the moon, was a head-on strike.
A new hypothesis gives the moon credit for cooling a hot, early Earth to the temperatures necessary for life to evolve.
Earth-viewing satellites captured key details of the Chelyabinsk meteor event in Russia. Continue reading →
One geologist thinks Earth has been banged up a bit more than previously thought -- never allowing the 'Snowball Earth' global ice age to develop.
A team of scientists claims to have found the first-ever definitive evidence of a comet striking Earth.
If a new theory is right, pieces of a comet that struck Earth 13,000 years ago might be coming around for another pass.
Large asteroid impacts on Earth could send seismic shock waves deep into the planet, causing super volcanic eruptions that helped wipe out the dinosaurs.
Crater formation is a a mysterious science, and one we won't get a good handle on until man returns to the pripristine craters of thelunar landscape.
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