A pizzlie is a cross between a polar bear and a grizzly bear, and this new hybrid animal may foreshadow as many as 34 hybrids to come as Arctic ice melts, say scientists.
Scientists say that Mars went through three ages, and the first age may have been habitable for life as we know it. Each stage on Mars can be found at nine different locations around the planet Earth today.
NASA atmospheric scientist Joel Levine makes the case for flying an unmanned airplane over the Martian surface.
Life on Mars: A new study has identified a spot that could be a good place to search for fossilized remains of life on Mars.
Ice divers prepare to enter the White Sea in northern Russia.
AURORA BOREALIS: The aurora borealis, or the northern lights, are seen above Bear Lake in Alaska in January 2005. The lights are the result of solar particles colliding with gases in Earth's atmosphere.
The summer solstice brings attention to Theia, a Mars-sized planet-wannabe some scientists say helped create the moon and altered Earth's axis.
Warming at the North Pole caused by the buildup of atmospheric greenhouse gases has reduced the ice that normally covers the Arctic Ocean at its lowest point in a few thousand years, a new study suggests.
Russian Prime Minister Vladimir Putin (r.) looks through a window of a water tank used for crew training at the Gagarin Cosmonaut Training Center outside Moscow on Tuesday.
ABBA is headed for the Rock and Roll Hall of Fame