National Geographic informs Saturn Moon Has Oxygen Atmosphere

An oxygen atmosphere has been found on Saturn's second largest moon, Rhea, astronomers announced Thursday.

For one thing, the 932-mile-wide (1,500-kilometer-wide), ice-covered moon is more than 932 million miles (1.5 billion kilometers) from Earth. For another, the average surface temperature is -292 degrees Fahrenheit (-180 degrees Celsius).

And at less than 62 miles (100 kilometers) thick,