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 ...

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

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 ...

Four planets will be widely visible to the naked eye through part of February, but calling them a 'planetary alignment' may not be the full picture.