Also Proxima Centauri is a Flare Star. So it's light output can vary by +/- 8%. ...

		valarauca1 on Aug 24, 2016 \| parent \| context \| favorite \| on: Planet Found in Habitable Zone Around Nearest Star Also Proxima Centauri is a Flare Star. So it's light output can vary by +/- 8%. And this can change within a matter of weeks. It is actually the most active flare star we know. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1063292/