Earth’s atmosphere now has more carbon dioxide in it than it has in millions — and possibly tens of millions — of years, according to data released Thursday by the National Oceanic and ...

Its atmosphere is mainly composed of hydrogen and helium, like that of Jupiter, our solar system's largest planet. But WASP-121b's atmosphere is not like anything ever seen before.

Earth’s atmosphere now has more carbon dioxide in it than it has in millions — and possibly tens of millions — of years, according to data released Thursday by the National Oceanic and ...