What are some skywatching highlights in December 2020? Catch the year's best meteor shower, the Geminids, in the middle of the month. Then witness an extremely close pairing of Jupiter and Saturn that won't be repeated for decades. And mark the shortest day of the year on the northern winter...

The ocean-observing Sentinel-6 Michael Freilich satellite launched from Vandenberg Air Force Base in California aboard a SpaceX Falcon 9 rocket.

The joint U.S.-European Sentinel-6 Michael Freilich is the next in a line of Earth-observing satellites that will collect the most accurate data yet on sea level and how it changes over time. It is the product of a partnership between NASA and ESA, who have joined forces for the first time on an...