A newly surfaced NASA directive reveals a fast-tracked effort by the United States to deploy a nuclear reactor on the Moon ...

As the world warms, long-lost shipwrecks and frozen artifacts are emerging from melting glaciers and eroding beaches. But there's also a downside.

The sediments are evidence of massive glacial meltwater floods, called Siku events, that happened during the last Ice Age.

Subduction, a crucial geological process on Earth, may have begun hundreds of millions of years earlier than traditionally ...