Asteroid impact and volcanic eruptions might have been a one-two punch that killed off the dinosaurs. New dates suggest the catastrophes were nearly simultaneous.
Despite climate change, sea ice will continue to make the Northwest Passage too treacherous to be a regular Arctic shipping route for decades, says study.
Scientists are studying the increasingly fast rate of summertime ice melt in Greenland. See a new NASA video, plus illustrations of the 2015 melt season.
Mars Orbiter Mission (MOM) is India's first interplanetary mission. It began orbiting Mars a year ago today. Mission goals - and spectacular images - here.
These latest Pluto images from New Horizons have scientists stunned, says NASA. It’s not just the breathtaking views, but the strangely familiar, arctic look.
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.