Earth has a surprising new player in the climate game: oxygen. Even though oxygen is not a heat-trapping greenhouse gas, its concentration in our atmosphere can affect how much sunlight reaches ...

There may have been no oxygen in the atmosphere of ancient Mars after all ... Related: Curiosity rover: 15 awe-inspiring photos of Mars (gallery) "Oxidation does not necessitate the involvement ...

While Venus is made up of about 96% carbon dioxide, scientists just discovered there's atomic oxygen in the planet’s atmosphere. According to findings from a joint project between NASA and the ...

A NASA spacecraft circling Saturn has discovered a wispy oxygen atmosphere on the ringed ... according to a NASA description. [Photos: The Moons of Saturn ] The oxygen on Dione may potentially ...

It is widely believed that Earth's atmosphere has been rich in oxygen for about 2.5 billion years due to a relatively rapid increase in microorganisms capable of performing photosynthesis.

And when the water reaches Martian soil, it would break down latent peroxides, releasing oxygen into the atmosphere—not yet enough to sustain human life, but enough to grow plants—which would ...

The biggest of Earth's mass extinctions may have left animals gasping for air, a new study finds. The Great Dying, as it is called, occurred some 250 million years ago. Roughly 90 percent of all ...