A Falcon 9 rocket lifted off on Monday night, sending four amateur astronauts on an unprecedented journey around Earth’s ...

SpaceX is sharing the first look at the vast expanse of ice layering Earth's poles after launching the private Fram2 mission, the first human spaceflight to polar orbit.

Grizzly bears, for example, are a subspecies of brown bear found in parts of North America. There are many different subspecies of brown bear found all over the world, from Kodiak bears in Alaska to ...