Solar System: Wandering Worlds

From meteorites that impact Earth, to a moon that orbits backwards, to an imposter lurking in the asteroid belt, a variety of strange, wandering worlds are rewriting what we know – and even how we think about – our solar system.

In 2021, cameras recorded the fall of the Winchcombe meteorite, allowing scientists to trace its cosmic origin.

Phobos, one of Mars' moons, has an uncertain origin, but its surface grooves show that tidal forces are pulling it apart. In time, Mars' gravity will shatter it entirely, creating a ring of debris around the planet.