Although the Earth’s been decidedly blue for 600 million years, rising populations of phytoplankton caused by rising temperatures are once again causing the world’s oceans to turn green.

As Earth approaches warmer levels experienced earlier in its geologic history, it may be bad news for human survival.

A few fossilized body parts hinted at an enigmatic bird's close ties to waterfowl like ducks and geese. A newfound skull may bolster that idea.

Could our solar system have been temporarily exposed to an enhanced flux of cosmic-rays at some point in the ancient past?

Millions of years ago, the Mediterranean ... on a critical moment in Earth’s geological history but also demonstrate the persistence of landforms over five million years,” Micallef added.