Earth's atmosphere wasn't always full of life-giving oxygen — it was once a choking mixture of carbon dioxide and other gases, more like the atmosphere of Mars or Venus. Subscribe to read this story ...

NASA's Cassini spacecraft has detected a very tenuous atmosphere known as an exosphere, infused with oxygen and carbon dioxide around Saturn's icy moon Rhea. This is the first time a spacecraft has ...

With a zap, a beam of ultraviolet light can blast carbon dioxide into oxygen gas, O 2. Because the sun hurls the same radiation, the reaction hints that breathable air could have formed on Earth ...

A startling discovery puts a new twist on photosynthesis, arguably the most important biological process on Earth. Two studies suggest that certain widespread marine microorganisms have evolved a way ...

Your red blood cells are tiny couriers, carrying life-sustaining oxygen from your lungs to every cell and bringing back ...

The Cassini-Huygens mission has discovered a tenuous atmosphere infused with oxygen and carbon dioxide at Saturn’s moon Rhea – the first time a spacecraft has captured direct evidence of an oxygen ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. The Mars Oxygen In ...

Forbes contributors publish independent expert analyses and insights. David Bressan is a geologist who covers curiosities about Earth. Life is thriving on planet Earth thanks to oxygen. Oxygen is a ...

Table 1 List of physical and electronic parameters for the adsorbate molecules. Figure 2: Guest-accommodating structures of 1 (open form). The alternative text for this image may have been generated ...

The carbon dioxide in Earth's early atmosphere could have been turned into oxygen by intense UV light as well as by photosynthesis. Earth's atmosphere wasn't always full of life-giving oxygen — it was ...