An image from the international Cassini spacecraft provides evidence of rainfall on the north pole of Titan, the largest of Saturn's moons. The rainfall would be the first indication of the start of a summer season in the moon's northern hemisphere. […]

Astronomers have found a new exoplanet that could alter the standing theory of planet formation. With a mass that's between that of Neptune and Saturn, and its location beyond the 'snow line' of its host star, an alien world of this scale was supposed to be rare. […]

NASA's Transiting Exoplanet Survey Satellite, TESS, has discovered a third small planet outside our solar system, scientists report. […]

Data from NASA's New Horizons spacecraft, which explored Kuiper Belt object Ultima Thule earlier this week, is yielding scientific discoveries daily. […]

Scientists from NASA's New Horizons mission released the first detailed images of the most distant object ever explored -- the Kuiper Belt object nicknamed Ultima Thule. Its remarkable appearance, unlike anything we've seen before, illuminates the processes that built the planets four and a half billion years ago. […]

The Juno spacecraft captured new images of a volcanic plume on Jupiter's moon Io during a December 21 flyby. JunoCam, the Stellar Reference Unit (SRU), the Jovian Infrared Auroral Mapper (JIRAM), and the Ultraviolet Imaging Spectrograph (UVS) observed Io for over an hour, providing a glimpse of the moon's polar regions as well as evidence of an active eruption. […]

NASA's New Horizons spacecraft flew past Ultima Thule in the early hours of New Year's Day, ushering in the era of exploration from the enigmatic Kuiper Belt, a region of primordial objects that holds keys to understanding the origins of the solar system. […]

Only hours from completing a historic flyby of Kuiper Belt object 2014 MU69, nicknamed Ultima Thule, NASA's New Horizons spacecraft is on course and ready to gather scientific data on the small object's geology, composition, atmosphere and more. Closest approach takes place in the early morning hours of New Year's Day -- 12:33 a.m. EST -- marking the event as the most distant exploration of worlds ever completed by humankind. […]

NASA's New Horizons spacecraft is set to fly by a target nicknamed 'Ultima Thule,' 4 billion miles from the Sun, on New Year's Day 2019. No spacecraft has ever explored such a distant world. […]

NASA's InSight lander has deployed its first instrument onto the surface of Mars, completing a major mission milestone. New images from the lander show the seismometer on the ground, its copper-colored covering faintly illuminated in the Martian dusk. […]