Io is small, but it's the most volcanically active world in our solar system. It has hundreds of active volcanoes. Now the Juno spacecraft has found one more.
Titan is Saturn's large moon. Some have proposed ice volcanoes to explain certain features on this moon's surface. But a thick, rigid ice shell would make ice volcanoes unlikely. Learn more on EarthSky.
The Milky Way and Andromeda merger has already begun. The two spiral galaxies will form one giant elliptical galaxy in 5 billion years.
"Who would have thought that Pluto is a graffiti artist, spray-painting its companion with a reddish stain that covers an area the size of New Mexico?"
Earth is not the only ocean world in the solar system. In fact, there are several. A new paper just published in Astrobiology seeks to plan out the best ways to explore these alien oceans.
Cosmic paintball! NASA image of a dramatic new impact crater on the planet Mars. Learn more on EarthSky.
Everything you want to know about the moon in 2017 - including phases, cycles, eclipses and supermoons - from world-renowned astronomer Fred Espenak.
Derechos typically form in late spring and summer. They are violent storm systems that can produce widespread wind damage across a large area. Check out the images in this post.
