sublimation

A mosaic of Saturn's rings. Credit: NASA/JPL/Space Science Institute

No Majestic Lord of the Rings, Saturn is Really a Master of Deception

This image of Mars was taken in October 24, with MOM taking advantage of its elliptical orbit to capture the planet's breadth. Credit: ISRO

Dry Ice, Rather Than Flowing Water, Could Have Sculpted Mars’s Mysterious Gullies