Clues from ancient rocks are helping to produce a coherent picture of how Earth's atmosphere changed from one that was almost devoid of oxygen to one that is one-fifth oxygen. Imagine a Star Trek ...

And that picture is a bumpy ride, filled with periods of oxygen entering the atmosphere before disappearing again, on repeat, in cycles that lasted tens of millions of years. To look that far back ...

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 ...

Mars' atmosphere likely once had more oxygen than Earth's, according to a new study by researchers at Oxford University. [PHOTOS: NASA's Curiosity Lands on Mars] By comparing rocks found by NASA's ...

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 ...

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 ...

Despite orbiting nearly 240,000 miles from Earth, our Moon may be periodically mingling with our planet’s atmosphere. New research shows that oxygen from Earth could be journeying all the way ...