A third reintroduced gray wolf from British Columbia has been found dead, this time in Rocky Mountain National Park. The U.S. Fish and Wildlife Service is investigating the death, as gray wolves ...

One of the longest-standing mysteries about Mars has been the presence of dark and light streaks on the rolling hills surrounding Olympus Mons. This week's image, from the European Space Agency, shows ...

A new study using high-resolution images from NASA's Mars Reconnaissance Orbiter (MRO) has revealed striking surface patterns ...

Researchers have discovered strange giant structures beneath the surface of Mars which tell us more about the red planet.