A 550-million-year-old fossilized digestive tract could shed light on the early history of animals on Earth and a key moment in evolution.

"For 50 years, what's called 'the phosphate problem,' has plagued studies on the origin of life." New research may solve it.

The Earth is partly made of stardust from red giant stars, aging stars that expand because they've run out of fuel in their core.

Scientists braved the heat to answer a question about oxygen and "Snowball Earth," a period when the oceans virtually froze from the poles to the equator.

A new theory involving volcanoes may partly explain the appearance of the first oxygen on Earth 2.5 billion years ago, researchers say.

A previously underestimated extinction event actually reaches the level of one of only six mass extinctions in geologic history, researchers say.

Around 2 billion years ago, there was a mass die-off of microbes. Researchers say it rivals the loss of life from the dinosaurs' extinction.

After the formation of the moon, meteorites deposited elements like gold on Earth and the moon, but not in the same amounts. New research explains why.

Astrophysicists have identified an event 4.6 billion years ago as the likely source of some of the most coveted matter on Earth.

We may have a proto-sun to thank for the Earth's solid surface and mild climate, researchers report.