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

Interstellar island hopping.

Cosmic Collisions Yield Clues about Exoplanet Formation

How Did the Sun End Up with Its Unique Rocky Planets? - Reasons to Believe

TRAPPIST-1 - Wikipedia

TRAPPIST-1 Planets May Be Far More Habitable Than We First Thought

Alien Solar System Gives Up More Secrets

Is it possible to make a planet habitable like Earth, and would it be worth it? - Quora

Astronomers find seven Earth-size planets where life is possible

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

Planets Archives - The Biogeologist

Yes, Two Planets Can Both Share The Same Orbit

Earthlike planets should readily form around other stars, meteorites suggest, Science

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

Earthlike planets should readily form around other stars, meteorites suggest, Science

It's unlikely that the TRAPPIST-1 planets support life

Potential for life is higher than ever on TRAPPIST exoplanets, researcher says