Saturn's little moon Mimas has now become the smallest of the known moons in our solar system harboring a hidden ocean of liquid water beneath an icy surface.
Arctic changes associated with global warming have increased the likelihood of disruptions in the polar vortex, which can cause cold snaps in southerly regions.
Planetary scientists knew there were massive buried deposits near Mars' equator, but not what they consisted of. New research found that it's buried water ice.
Nicholas Copernicus was the astronomer who, five centuries ago, explained that Earth revolves around the sun, rather than vice versa. A true Renaissance man.
X flares on the sun are the most powerful explosions in the solar system. We're likely to see more of them as we approach solar maximum, possibly due this year.
Members of the EarthSky community - including scientists, as well as science and nature writers from across the globe - weigh in on what's important to them.