"We're arguing that intelligent life may not require a series of lucky breaks to exist," said lead author Dan Mills of the ...

Renewable Energy Dependence Imagine a world where the sun, wind, and water are the primary sources of our energy. Without ...

Purple Earth Hypothesis suggests Earth was once a purple planet. Early microbes used retinal, not chlorophyll, for ...

Earth's oceans may have been green for billions of years until the first photosynthetic organisms flooded our atmosphere with ...