Aliens might be transmitting communications signals to each other across exoplanets, some astronomers think. Since these signals are likely sent as narrowband radio waves, we may now have a way to ...

The borders at Mexico and Canada continues to present a daunting challenge. It’s obvious that the U.S. should and could be doing a better job at the border. Yet, the answers aren’t easy. More ...

With next-generation telescopes, tiny space probes, and more, scientists aim to search for life beyond our solar system—and make contact. Propelled to a fifth the speed of light by a laser beam more ...