Titan, Saturn’s largest moon, possesses a thick, nitrogen-rich atmosphere that bears striking similarities to that of early ...

Earth's atmosphere is a mixture of gases that are held in place by gravity. By far the largest component is nitrogen, which makes up nearly 80% of the atmosphere.

The various iron oxide minerals in shades of gray were formed by oxidation in the Earth's atmosphere. Scale bar: 10 micrometers = 0.01 millimeters. Credit: Fabian Zahnow ...