Add Yahoo as a preferred source to see more of our stories on Google. Scientists are observing an Earth-like exoplanet that may contain water using NASA's James Webb Space Telescope, the space agency ...

Our solar system is a lot like the story of Goldilocks and the Three Bears. Planets that are located close to the sun can be too hot, while those located further from the sun can be too cold, making ...

When the Kepler space telescope malfunctioned last spring, it looked as though its incredibly successful planet-hunting mission might be over—and NASA made that sad fact official a few months later.