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 ...

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 ...

A new study reveals that the aerobic nitrogen cycle in the ocean may have occurred about 100 million years before oxygen began to significantly accumulate in the atmosphere, based on nitrogen isotope ...

However, producing oxygen on the Red Planet is challenging. Although there is plenty of the element oxygen in the Martian atmosphere ... Related: Stunning Mars photos by the Curiosity rover ...

There's something strange about the oxygen in the atmosphere ... Related: Photos: Gale Crater on Mars SAM confirmed that 95% of Mars' atmosphere is made up of carbon dioxide (CO2) and the other ...

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 ...

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.

In what marks a significant first for humans to finally travel to Mars, an instrument on NASA's Perseverance rover has successfully converted some of the planet's atmosphere into oxygen ...

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 ...