The building blocks of life may be much more common than we previously thought. Observations of a comet coming from outside ...

When I was four, my parents took me to a planetarium for the first time. It was a huge one, in Chicago; it seemed as big as space itself. I enjoyed many more visits to planetariums over the years, but ...

SAN DIEGO — The toxic plume from the Tijuana River can be seen from outer space. An image from NASA shows the plume flowing off south of Imperial Beach and spreading into the Pacific Ocean. NASA's ...