If you could travel back in time to early earth, your lungs would choke on an atmosphere devoid of oxygen. Why is earth the only known planet with life A new simulation of the rise of oxygen suggests that it was driven by the planet itself, and needed little help from living organisms
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Earth is the only planet in our solar system that has free oxygen in the atmosphere
As far as we are aware oxygen doesn't exist as free o2 naturally because oxygen will bond with other elements to form oxides like rust, aluminum oxide, or carbon dioxide.
Oxygen can form from the chemical breakdown of water via sunlight, but only in trace amounts Earth is the only planet known to have a significant amount of oxygen in its atmosphere. Current theories suggest that earth's o 2 levels have risen three times over its 4.5 billion year history The first great oxidation event occurred roughly 2.4 billion years ago, and established oxygen as a major element of the atmosphere.
It's extremely improbable that we're the only planet like this Most planets don't have free oxygen in their atmospheres because it oxidizes and quickly combines with other elements and chemicals on the planet.
