It's back! The target comet of ESA’s Rosetta mission disappeared behind the sun and out of the Earth’s view last October. Comet 67P/Churyumov-Gerasimenko can now be seen again.
On March 5, NOAA reported that ice cover over North America's Great Lakes had reached 91 percent. The lakes have not been so covered with ice since 1973.
The Arctic is home to a growing number of whales and ships, and to populations of sub-Arctic whales that are expanding their territory into newly ice-free Arctic waters.
A tiny zircon crystal found on a sheep station - or ranch - in western Australia is now the oldest known piece of our planet, dating to 4.4 billion years ago.
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.