Earth-like planets in the Trappist-1 solar system may be exchanging life through meteorites

Interstellar island hopping.

Yes, two planets really can share the same orbit - Big Think

We May Not Be Ruling Out Finding Life Around TRAPPIST-1 After All

New studies find TRAPPIST-1 planets are probably rocky, watery worlds

Solar system with Earth-like planets a fresh chance for new life

TRAPPIST-1 System Ideal for Planet-Hopping Life?, Astrobiology, Astronomy

So is TRAPPIST-1 a flaring hell or a planetary system where it practically rains life?

TRAPPIST-1 Exoplanets Solar System Comparison – Exoplanet Exploration: Planets Beyond our Solar System

It's Our Solar System in Miniature, but Could TRAPPIST-1 Host Another Earth?

8 Planets That Could Sustain Human Life

TRAPPIST-1: Nearby Dwarf Star Hosts Seven Earth-Size Exoplanets, Astronomy