Previous measurements of Earth's girth were slightly off, but the difference is enough to affect forecasts of sea-level rise and other effects of global warming.

The massive tempest is currently "starving" the solar-powered rovers, so NASA has put the robots on regular nap-time schedules to try and wait out the storm.

Scientists need to rethink what constitutes life in their search for ETs and seek out so-called "weird" life-forms that could thrive in extreme environments, a new report says.

Ancient genetic material from the southern part of the island suggests that the region supported a diverse forest as much as 800,000 years ago.

Results from a new Antarctic ice core reveal wild swings of 15 degrees Celsius (27 degrees Fahrenheit) in polar temperatures over the past 800,000 years.

Despite its bathtub-ready appearance, Hyperion—Saturn's largest irregularly shaped moon—is anything but spongy.

Our universe may have been born from a previous universe's "big bounce." But we'll never know too much about that universe, a new theory suggests.

See pictures of some of UNESCO's new additions to the World Heritage list, from Sydney's famous opera house to an archaeological city in Iraq.

Adventurers exploring a cave on an island in the Indian Ocean have discovered the most complete and well preserved dodo skeleton ever found, scientists announced.

The mummy of a salt mine worker, naturally preserved in the mineral for 1,800 years, surfaced recently in Iran—but scientists might just leave it be.

A 1.2-million-year-old tooth discovered last week in northern Spain came from Western Europe's earliest known human, according to the team that made the find.

NASA's Mars rover Opportunity will descend into the planet's enormous Victoria Crater late next week, mission scientists announced yesterday.

Ancient squash, peanut, and cotton remains show that farming spread rapidly across the Americas about 10,000 years ago, a new study says.

The fear of exile and almost certain death causes emerald coral gobies to go on crash diets rather than grow large enough to threaten higher-ranking fish.

Watch as archaeologists reveal how they identified the long-lost mummy of Hatshepsut, an Egyptian ruler famous for donning the male garb of a pharaoh.