The number of known exoplanets seems to grow every day. Most of them are worlds completely unlike our own. But some get pretty close to something resembling home - and may someday become exactly that.

The enchanting dunescape stretches over 43 miles (70 km) along the coast and over 30 miles (50 km) inland. Lençois translates ...

Beyond Neptune lies the Kuiper Belt, a vast expanse of icy bodies that may hold clues to the solar system’s formation. These ...

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

Every so often, multiple planets in our solar system align, producing some of the Earth’s most awe-inspiring ... appearing relatively close — just 1.5 degrees apart. This will be your chance ...

"It's like a lid on top of its convective mantle." But without any other nearby planets exhibiting plate tectonics to compare Earth's system to, it's hard to know precisely what causes a planet to ...