An artist’s conception of an "eyeball Earth", a planet tidally locked and perpetually facing a red dwarf star in a close orbit. Some scientists theorize that this hypothetical class of planets may be good candidates for harboring life; and they would be relatively easy to detect because of the light-dimming disturbance of the star due to the planet’s close and frequent revolution.

An artist’s conception of an "eyeball Earth", a planet tidally locked and perpetually facing a red dwarf star in a close orbit. Some scientists theorize that this hypothetical class of planets may be good candidates for harboring life; and they would be relatively easy to detect because of the light-dimming disturbance of the star due to the planet’s close and frequent revolution.