Purple Earth hypothesis

The Purple Earth hypothesis is a theory that suggests that early Earth was completely covered with a purple-colored ocean that was made up of hydrogen, hydrogen sulfide, and ammonia. This ocean would have been much brighter and more colorful than the blue-colored ocean on the planet today. Scientists think that this is because the atmosphere of early Earth was much different, with high concentrations of methane and ammonia and no oxygen. The purple ocean would have been filled with bacteria that were able to use the chemicals in the ocean to make food. Over time, these bacteria would have changed the composition of the ocean, leading to a blue-colored ocean with oxygen in it. This blue ocean allowed life to form on Earth.