The global climate could warm by 2.5 degrees F. by the end of the century, even if countries undertake stringent efforts to curb greenhouse-gas emissions, according to a new study from a team of climate scientists in the United States, China, Japan, and five European nations.
This figure is more than twice as high as the […]

Some 2 billion to 3 billion years after the big bang, the number of new stars in the universe mushroomed. In the past, many scientists suggested that the bursts of new stars were created because smaller galaxies collided – and as they did, their gravity caused gases in each galaxy to clump together and form […]

When a segment of a population splits off genetically and evolves into a new species, it typically happens because the group gets separated from the rest of its kind. But now, researchers say they have demonstrated that evolution from one species to another doesn’t always require geographical isolation between groups of the same species. Instead, […]