Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission ...

Billions of years ago, it rained on Mars. The water collected in valleys and rivers, filled and spilled over the rims of craters, and was funneled into canyons, perhaps even making its way to a large ...

Thwaites lines up most closely in longitude with U.S. Mountain time, so that’s what this expedition will be using. But our ...

Mars keeps refusing to behave like the dead, simple world many scientists once imagined. Each new rover trench, fractured boulder and orbital scan is turning up stranger chemistry, unexpected ...

Although renowned for dozens of spectacular peaks, Acadia National Park on Mount Desert Island has more than outstanding ...

Fresh evidence of volcanic activity on Mars is reshaping how scientists think about the planet’s potential to host life, past or present. Instead of a cold, geologically dead world, Mars increasingly ...

With a nod of the head, Ben Stokes admitted he had been beaten by a better opponent and accepted that his chance of becoming ...

“On the Loose” was more than a book; it was a passport and a ticket to public lands. It was an irresistible invitation to the ...

In the shadow of Pikes Peak, where the air is thin and the bargains are thick, sits a treasure trove that has Colorado’s deal-hunters crossing county lines with empty trunks and returning home with ...

Tucked between the Sierra Nevada and the El Paso Mountains lies a California gem that somehow escaped the Instagram influencer invasion and skyrocketing price tags that plague the state’s more famous ...

The geology of the ocean floor is truly spectacular — perhaps even more than land geology. Unfortunately, it's really hard to study.

CC0 Usage Conditions ApplyClick for more information. Was Mars once covered in oceans? If so, where did they go? Like many scientific endeavors, understanding the history of water on Mars is a team ...