While Earth's core consists mostly of iron, its density implies that lighter elements are also mixed in. Because hydrogen is ...

The moon is about 384,400 kilometres from Earth right now and our days are about 24 hours long. The moon pulls on Earth’s ...

For centuries, Earth has been pictured as a near-perfect blue sphere floating through space — but a new high-precision gravity model is revealing a far stranger reality. Using detailed measurements ...

But the amount of sunlight that Earth reflects—known as its albedo—changes. And that means the amount of energy that Earth absorbs changes, too.

Contrary to what some people think, the Earth isn’t the center of the Universe. But what if it was? What if those medieval astronomers were right, and everything does revolve around you? How would ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Earth is illuminated against the blackness of space in this ...