The color of Earth’s sky has changed over time due to the presence and activities of different life forms. Initially, the sky had a grayish-blue-green tint due to a nitrogen and carbon-dioxide-rich atmosphere with little oxygen. Methanogenic bacteria then turned the sky orange by producing methane, which formed hazes that absorbed blue light. Eventually, cyanobacteria produced oxygen, which cleared the haze and restored the sky to its current blue color.
Related Posts
T. Rex Had Vegetarian Cousins—And They Confused Scientists For Years
T. rex and Velociraptor may be famous for their menacing faces and slightly Hollywood-ified personas, but one thing…
Carbon dioxide has been regulating Earth’s climate for hundreds of millions of years – new study
300 million years ago, much of the planet was covered in ice. james_stone76 / shutterstock Hana Jurikova, University…
The World’s First Swimming “Superpredator”
Ichthyosaurs were a diverse group of marine reptiles that coexisted with dinosaurs and pterosaurs during the Mesozoic era,…
Gut bacteria digest food additives, new study finds
A new study reveals that human gut bacteria can digest common "indigestible" cellulose-based food additives when primed by natural dietary fiber found in fruits and vegetables.