An exclusive, challenging hike at Meteor Crater is the closest thing to walking on the moon without going there. What hikes include and what it costs.

This piece is part of a special project on deep time examining what the Western U.S. was like thousands, millions and even billions of years ago, and how that history is still visible and ...

A massive crater hidden beneath the Atlantic seafloor has been confirmed as the result of an asteroid strike from 66 million years ago. The new 3D seismic data reveals astonishing details about the ...

South Africa's Vredefort crater, the Earth's largest proven meteorite impact site, defies the typical circular depression ...