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
Volcanoes, diamonds, and blobs: a billion-year history of Earth’s interior shows it’s more mobile than we thought
Earth’s interior 80 million years ago with hot structures in yellow to red (darker is shallower) and cold…
New discovery: fossilised giant zebra tracks found in South Africa
An illustration of two giant Cape zebras alongside a much smaller plains zebra. Maggie Newman Charles Helm, Nelson…
Monarch butterflies join the Red List of endangered species, thanks to habitat loss, climate change and pesticides
Monarch butterflies cluster on a eucalyptus tree at Pismo State Beach’s Monarch Butterfly Grove in California. Ruby Wallau/Getty…
I set out to investigate where silky sharks travel − and by chance documented a shark’s amazing power to regenerate its sabotaged fin
Rather than a tracking tag telling scientists where this shark traveled, its violent removal let them observe an…