Exoplanets dodge bombardment in their infancy

The fragile orbits of the TRAPPIST-1 planets confirm their gentle start to existence.

Illustration looking towards TRAPPIST-1 (the star), showing several planets in silhouette
This illustration shows what the TRAPPIST-1 system might look like from a vantage point near planet TRAPPIST-1f (at right). Credit: NASA/JPL-Caltech
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