A new study offers an explanation for unusual chemical signatures found in some volcanic rocks.

Known as the giant-impact hypothesis, this proposed event involves a collision between Earth and a hypothetical Mars-sized protoplanet astronomers call Theia.

Most scientists think that Earth and Mars took shape this way from rocky pieces swirling around the young sun around 4.5 ...

Earth and Mars may have formed through very different processes, despite developing as neighbors in the early solar system.

A sliver of iron thinner than a human hair was squeezed to deep-Earth pressures between the tips of diamond anvils, then ...

A small rock from a bay in Papua New Guinea has given geologists an unusual record of a trip more than 90 kilometers into ...

Unusual hydrogen signatures in volcanic rocks may come from Earth’s core. Simulations suggest ancient magma crystallization cannot explain the differences.

Molten rock deep inside Earth can take up an extra supply of oxygen under pressure, according to a new study. That finding ...

Japan launched a $578 million mission Monday on a five-year expedition to land on the largest moon of Mars and retrieve ...

Today, our planet is teeming with life, but it has not always looked the same. Long before forests reached skyward, animals walked on land, and the rise and fall of dinosaurs, our planet was shaped by ...

Bands formed at the tail end of the decade, including these iconic groups formed in 1969, would go on to shape new eras and ...

Where did it start? How did it grow complex? Why did it get big? Three moments in Earth’s early history when evolution ...