When the Rosetta spacecraft swooped into orbit around a comet in 2014—the first mission to do so—it noticed something strange. The barbell-shaped lump of rock was shedding molecules of oxygen, and ...

For the first time, astronomers have found molecular oxygen — the same gas humans need to breathe — in a galaxy outside the Milky Way. Oxygen is the third most common element in the cosmos, after ...

Latest findings regarding nitric oxide have the potential to reshape fundamentally the way we think about the respiratory system -- and offer new avenues to save lives. Scientific dogma has the ...