Scientists find "strongest evidence yet" of life on distant planet
Ancient jawbone found in sea linked to mysterious human ancestors
Ancient altar found in jungle apparently used for child sacrifices
Dire wolf pups born 12,500 years after extinction, company says
NASA astronaut, 2 Russian cosmonauts blast off on flight to space station
Space tourists complete first-ever flight around Earth's poles
On the Edge: The people and polar bears of a warming arctic
SpaceX's Fram2 launch sends civilian crew into flight around Earth's poles
