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This image contains individual images of exoplanets compared with Jupiter, Neptune, Earth and Mars. Their distances from Earth are provided in light-years (ly); Proxima Cen b at 4.2 ly, Kapteyn b (13 ly), GJ 667 C c (22 ly), GJ 667 C e (22 ly), GJ 667 C f (22 ly), Trappist-1e (39 ly), Trappist-1f (39 ly), Trappist-1g (39 ly), Kepler 186 f (561 ly), Kepler 1229 b (770 ly), Kepler 442 b (1115 ly) and Kepler 62 f (1200 ly).

 6 The habitability of planets