Astronauts are spending a year aboard the International Space Station, and researchers are looking at what happens to their bodies at the molecular level.
The winds move at 2 kilometers per second. That's about 7 times faster than the speed of sound and 20 times faster than any winds ever recorded on Earth.
As winter sets in at the south pole of Saturn's moon Titan, a massive ice cloud has been forming. It's the "button" in this image from the Cassini spacecraft.
Eleanor Imster has helped write and edit EarthSky since 1995. She was an integral part of the award-winning EarthSky radio series almost since it began until it ended in 2013. She and her husband live in Tennessee, where they enjoy guitar playing and singing. They have 2 grown sons.