Everyone knows the Earth has constantly evolved over the course of billions of years, and the natural landscapes we see today ...

The earliest lifeforms, cyanobacteria, appeared around 4 billion years ago. These organisms, now known as algae, were among the first to engage in oxygenic photosynthesis.

Scientists have discovered evidence that Earth's oceans were once green, hinting that this could be a marker of early life, ...

Ancient oceans, which were heavy on iron, interacted differently with light wavelengths, retracting green light into the ...

Instead, they were a striking shade of green, shaped by ancient microbial life and the chemical composition of early seas.

A photo of the earth and its oceans taken from space. The photo has been changed so we can see all of the earth’s surface in one picture. The Pacific Ocean is the world’s largest ocean.

Imagine the world’s oceans with their beautiful blue color. Now, imagine that the same oceans were green. This is the intriguing possibility suggested by new research from Nagoya University in Japan.

Critics of this hypothesis argue that the oceans were—and still are—too ... an electrical current to a mixture of water and Earth’s early inorganic gases, including methane, ammonia, and ...

Around 700 million years ago, Earth was ... ocean became enriched in minerals, the prevailing hypothesis was that this was the product of an oxygenating planet. As early cyanobacteria produced ...