What exactly is a cool dwarf? Doesn’t seem to be a real category - there seems to be one called ultra cool dwarves which is a subtype of red dwarf stars includi

What exactly is a cool dwarf? Doesn’t seem to be a real category - there seems to be one called ultra cool dwarves which is a subtype of red dwarf stars including TRAPPIST-1. Doesn’t exclude the tidal locking problem, but can’t confirm if they are more immune to solar variability and storms. Also apparently the planets will never be brighter than sunset in earth. The author could have at least mention some of the potential problems. I stand by calling this article disingenuous. https://en.m.wikipedia.org/wiki/TRAPPIST-1 https://en.m.wikipedia.org/wiki/TRAPPIST-1