Water vapor is Earth’s most abundant greenhouse gas. It’s responsible for about half of Earth’s greenhouse effect — the process that...

Scientists have spotted two space rocks that may be Earth's freshest asteroid neighbors. The strange pair of near-Earth asteroids is...

The telescope's chief scientist discussed its nearly 40 days in space so far It's been a whirlwind 38 days in space for the James Webb...

NASA's James Webb Space Telescope has reached its deep-space destination, but it'll be a while yet before the $10 billion observatory...