Researchers say they have found "unequivocal evidence" that a meteorite smashed into Earth 3.47 billion years ago, ...

James Turrell discusses his ongoing land art piece, Roden Crater, created within a pit formed by an extinct volcano in the Arizona desert. ART21: Where are we, right now? TURRELL: Well, right now ...

The crater has undergone at least one glaciation event since it formed, meaning it was swallowed by an ice sheet when glaciers last covered southwestern Alaska between 23,000 and 14,700 years ago.

If it nails its touchdown on the lunar surface, Athena will unpack its payloads, including a Micro-Nova robot named Grace that will hop into a nearby crater and then hop back out. The robot is ...

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