Cool Stars 14 - Submitted Abstract # 392 This version created on 13 October 2006 Life on the Dark Side: Tidally Locked Planets Sara Seager, Carnegie Institution of Washington The potential to detect habitable exoplanets in the very near future is real: super-Earths in short-period orbits around M stars. We discuss how to identify planetary bulk composition from exoplanet mass and radius measurements. The bulk interior composition of super-Earths is directly related to their surface and atmosphere conditions---and hence the possibility for life. Life on super-Earths is as yet an unaddressed question. We describe our investigation of signs of life on hot super-Earths, based on possible metabolic byproducts. ----------------------------------