New data indicates the continuation of a long-term decline in summer ice underway since at least 1979. Researchers say roughly half the decline can be attributed to global warming.
NASA's GRAIL mission, which launched Saturday, will plumb the depths of the moon by measuring its gravity field. It should reveal much about the moon's formation and evolution.
Tropical storm Irene illustrates improvements that forecasters have made in forecasting a hurricane's track. But it also highlights needed improvements in forecasting storm intensity.
First came an earthquake in Colorado. Then Virginia's quake shook the US from South Carolina to New England. Finally, San Francisco had a rattler as well. Are they connected?
A new study of the far side of the moon suggests that the Earth once had a tiny second moon, which collided with the bigger one.
Archaeopteryx: The creature long believed to be the earliest known bird may not have been a bird at all, suggests a new Chinese fossil find.
Trojan asteroid: NASA has discovered that Earth has an asteroid companion traveling just ahead of our planet as it orbits the sun. This so-called Trojan asteroid could serve as a stepping stone to celestial objects farther afield.
Satellite Cassini flew through geyser plumes spouting from Enceladus and gathered ice crystals. These crystals are salt-rich, suggesting that a hidden salty sea lurks beneath Enceladus's icy cap.
A study of the genomes of two families has found that the number of mutations thought to occur each generation had been overestimated, suggesting that the pace of human evolution is slower than scientists had thought.
Scientists have found evidence of supermassive black holes at the core of the earliest galaxies, a discovery that could shape theories about galaxy formation.