A new study suggests that a global rise in ocean temperatures has cut the number of phytoplankton, which are the bedrock of the food chain, by 40 percent since 1950. Other scientists link the rise in ocean temperatures to global warming.
Marsupials did not, as had been previously thought, did not get their start in Australia, a new genetic study suggests. Rather, they share a common ancestor in South America.
A child dressed as clown attends a mass at the Basilica of Guadalupe in Mexico City on Wednesday. Hundreds of clowns took part in the annual event to thank the Virgin of Guadalupe for helping them find work through the year, according to local media.
A 2.7 square mile section of Greenland's Jakobshavn Isbrae glacier has fallen into the sea, reports NASA.
Ice divers prepare to enter the White Sea in northern Russia.
This image depicts a vast canyon of dust and gas in the Orion Nebula from a 3-D computer model based on observations by NASA's Hubble Space Telescope and created by science visualization specialists at the Space Telescope Science Institute (STScI) in Baltimore, Md. A 3-D visualization of this model takes viewers on an amazing four-minute voyage through the 15-light-year-wide canyon.
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.
Aurora Australis was captured on film by astronauts on the International Space station during a solar storm.
Gulf oil spill is a crude reminder of the many ways humans are fouling the planet. Can Earth survive?
Today, our sun reaches its northernmost point in planet Earth's sky. Called a solstice, the date traditionally marks a change of seasons - from spring to summer in Earth's Northern Hemisphere and from fall to winter in Earth's Southern Hemisphere. In this image from 2007, NASA's Solar Terrestrial Relations Observatory satellites provided the first three-dimensional images of the sun. STEREO, a two-year mission that launched October 2006, provided a unique and revolutionary view of the Sun-Earth System.