- Aug 30, 2005Scientists from the Australian Antarctic Division, the University of Western Ontario, the Aerospace Corporation, and Sandia and Los Alamos national laboratories found evidence that dust from an asteroid burning up as it descended through Earth's atmosphere formed a cloud of micron-sized particles.
- Aug 12, 2005A number of hypotheses have been used to explain how free oxygen first accumulated in Earth's atmosphere some 2.4 billion years ago, but a full understanding has proven elusive. Now a new model offers plausible scenarios for how oxygen came to dominate the atmosphere.
- Jul 11, 2004This week NASA will add to its tools for tracking changes in the global climate with the launch of the Aura spacecraft. Primarily geared to imaging atmospheric changes, Aura will answer questions about ozone: the good, the bad and what makes Earth unique among
- Jun 5, 2004How the Earth's early climate changed has much to do with the fate of its greenhouses gases, carbon dioxide and methane. A conjecture to test revolves around the continents absorbing carbon dioxide. Akin to what happens today on Saturn's moon Titan also is the