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
The heroic effort to save Florida’s coral reef from devastating ocean heat
Elkhorn coral fragments rescued from overheating ocean nurseries sit in cooler water at Keys Marine Laboratory. NOAA Michael…
Paleolithic Prey Size Drives Evolution of Hunting Tools and Human Cognition
A recent study by Tel Aviv University‘s Department of Archaeology researchers sheds light on the fascinating interplay between…
Connecting fragmented wolverine habitat is essential for their conservation
Wolverine numbers are declining globally due to heavy trapping and predator killing by humans, habitat loss, climate change…
How medieval chroniclers interpreted solar eclipses and other celestial events
Giles Gasper, Durham University and Brian Tanner, Durham University Over 800 years ago, around 1195, Gervase, a monk…