Asteroid Vesta, long considered a stalled protoplanet, may actually be a massive fragment of a larger world that once existed in our solar system. New findings based on gravity-field mapping and ...

Vesta’s classification has vexed astronomers for decades, but a recent study is forcing planetary scientists to reevaluate its internal structure.

An alternate explanation that fits the evidence is that Vesta was once part of a planet – but which planet that might been ...