earth

It was cold, once

What caused the largest glaciation event in Earth’s history, known as ‘snowball Earth’? Geologists and climate scientists have been searching for the answer for years but the root cause of the phenomenon remains elusive. Now,…


Long distance picture of Earth

This composite image of Earth and its moon, as seen from Mars, combines the best Earth image with the best moon image from four sets of images acquired on Nov. 20, 2016, by the High…


Wanna see Switzerland? Look no further.

Multiple scans from the Copernicus Sentinel-2A satellite have been stitched together to create this complete image of Switzerland. (…) The southern part of the country is dominated by the Alps, some of which are snow-capped….


Ion thunderstorms!

Satellite engineers have been puzzling over why GPS navigation systems on low-orbiting satellites like ESA’s Swarm sometimes black out when they fly over the equator between Africa and South America. Thanks to Swarm, it appears…


The mother of all collisions

New research led by Johns Hopkins University scientists argues that a layer of iron and other elements deep under ground is the evidence scientists have long been seeking to support the hypothesis that the moon…


A view from Proxima Centauri

What if you traveled to Proxima Centauri, the closest star to the Sun at the moment, and looked back in our direction? You would notice a slightly different constellation of Cassiopeia in the sky. The…


Crackling aurora

Arctic wilderness tales often wax poetic about dazzling displays of northern lights painting the skies. But for at least the past century, some of those stories have also mentioned eerie noises associated with especially powerful…