Spacecraft spies two strange phenomena in the Martian atmosphere: An unexplained high-altitude dust cloud and aurora that reaches deep into the Martian atmosphere.
A 480-million-year-old fossil of a gigantic sea creature is giving paleontologists insights into the ancestors of modern-day arthropods such as lobsters and scorpions.
A stack of four identical spacecraft will study Earth's magnetosphere - the comet-shaped magnetic shield that protects us from "space weather." Watch the launch.
Swiss plane Solar Impulse 2 landed Monday in Muscat, Oman, the first stopover in the attempt to fly around the world powered by the sun alone. Follow the flight.
The Dawn spacecraft has made history. It has become the first mission to visit a dwarf planet when it successfully slipped into Ceres' orbit on March 6.
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.