Key PointsAbout 4.5 billion years ago, a dramatic event transformed the young Earth when a large protoplanet known as Theia struck our planet ...

About 4.5 billion years ago, a colossal impact between the young Earth and a mysterious planetary body called Theia changed ...

A new study shows the mysterious impactor probably formed in the inner solar system, right next to early Earth.

Isotopic fingerprints in lunar, terrestrial, and meteorite samples show Theia formed in the inner Solar System, likely near ...

For that purpose, 3I/ATLAS must arrive within Jupiter’s radius of gravitational influence — the so-called Hill radius, inside ...

Video. Moon’s precursor planet, Theia, disappeared billions ago, leaving scientists no direct chemical evidence to support ...

Moon’s precursor planet, Theia, disappeared billions ago, leaving scientists no direct chemical evidence to support the ...