Galilean moons

The Perseids meteor shower over the Very Large Telescope, Chile, in August 2010. Credit: ESO/S. Guisard, CC BY 4.0

Why the Perseids Meteor Shower, Which Peaks This Time of Year, Is Awesome

Callisto, one of the four Galilean moons. Credit: NASA

Infinite in All Directions: Lehrer’s Comeback, Curbside Geology and Life on Titan