Astronomers have found icy objects in the outer solar system whose orbits appear anomalous. This video examines the evidence for a possible ninth planet, featuring interviews with the lead researchers ...

So far, astronomers have confirmed over 6,300 exoplanets circling a host star beyond our solar system. They range from small, rocky worlds to enormous orbs of gas like our own Jupiter or Saturn. Some, ...

NASA's Hubble Space Telescope completed its 200,000th orbit around Earth on Sept. 19, marking another milestone for an observatory that continues to transform our understanding of the universe. Hubble ...