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The ashen glow on a thin crescent Moon is sunlight bounced off Earth. Decades of measuring that earthshine revealed something unsettling: the planet is reflecting less light.

Earth leaks roughly 3 kg of hydrogen every second into space. It always has. Here's why that slow bleed is the difference between a living world and a dead one.

A growing dent in Earth's magnetic shield is frying satellites and splitting in two. Here's what the South Atlantic Anomaly really means for our planet.

Those shimmering green curtains in the sky look peaceful — but they're caused by the Sun bombarding Earth with billions of charged particles. Here's the violent physics behind the northern lights.