A distinctive blue and green image of Earth reveals our planet's most remarkable features. At 4.54 billion years old, our home world is a venerable object. But it was only with the arrival of the ...

Of all the planets in our solar system, the Earth is the only one that—as far as we know—supports life. So why is our planet alone so hospitable? In part, we owe our existence to a process ...

For a long stretch of Earth’s history, our planet might have looked green from a distance, instead of the pale blue dot we know today. Earth’s green period, which lasted from around 3 billion ...