<img src=”https://naked-science.ru/wp-content/uploads/2025/02/SEI_240412248.jpg” alt=”Ancient ocean painted the Earth green for 2.5 billion years”/>Three billion years ago, our planet could have looked not pale blue, as it is seen from space today, but had completely different shades. Scientists have found a connection between iron in the ocean, the evolution of bacteria and the color of the Earth in the past.