China's Shijian-21 and Shijian-25 satellites, known as SJ-21 and SJ-25 for short, likely docked together in geosynchronous ...

A planet that is snuggled up closely with its host star may be igniting colossal flares that strip it of its own mass. In a first-of-its-kind observation, astronomers have found a giant exoplanet in ...