More information: X C Abrevaya et al, An experimental study of the biological impact of a superflare on the TRAPPIST-1 planets, Monthly Notices of the Royal Astronomical Society (2024).

The innermost planets would have formed first, so Pichierri and his team divided the TRAPPIST-1 system into two sub-groups — the inner planets b, c, d and e, and the outer planets f, g and h.

Planetary paradox An artistic impression of the exoplanet Trappist-1 b shortly before it passes behind the cool, red dwarf star Trappist-1. (Courtesy: Thomas Müller (HdA/MPIA)/CC BY-SA) Located about ...