Everything you should know about TRAPPIST-1 exoplanets

There is almost certainly no life on any of the planets in the Trappist-1 system. This is because the host star is an ultra-cool dwarf star which lasts trillions of years and was probably formed close to the formation of our galaxy. This would give plenty of time for any life that exists on any of the planets to evolve into intelligent life forms who would have plenty of time to either destroy all life on their planet or construct radio emitting devices. as far as I know, there are no abnormal radio signals from the trappist-1 system that we know about. which means either intelligent life never evolved or it wiped out all other life on the planet. if intelligent life never evolved on any of the planets in the billions of years that system has existed, it is unlikely to be hospitable to any life at all, even extremophiles.

one mechanism that might sterilize the planets is the fact that small stars like Trappist-1 are prone to violent stellar activity, much more than our own sun. the kind of activity from this star would sterilize earth and wipe out our atmosphere in a matter of millennia. this could be avoided for planets of about 5 earth masses, since they would have a much larger magnetic dynamo in their core. and a much thicker atmosphere