Computer simulations show that the heart-shaped Sputnik Planum region on Pluto is covered with icy, churning, convective "cells," less than a million years old.
Confirmation that Mars came out of its last ice age 400,000 years ago. Plus insights into the water cycle on Mars, a possible help to future space colonists.
NASA said the June 2 meteor was the largest seen by its camera network in 8 years. It identified this smoke trail as what the meteor left behind. Video of the fireball here.