Planet demographics reveal a puzzling lack of worlds in a certain size range throughout the galaxy F or centuries our solar system was the only planetary system known to humans. We had no proof other ...

Last year, astronomers discovered an unusual Earth-size exoplanet they believe has a hemisphere of molten lava, with its ...

Spring Training debut Phillies mailbag looks at the Phillies rotation, strengths and weaknesses, and prospects waiting in the wings.