This plot summarizes all confirmed exoplanets known today (~1,800) as a function of distance from the Sun (light years), their stellar flux (i.e. the energy that they receive from the star where one equals the energy Earth receives from the Sun), their approximate size (see legend top left), and those in the habitable zone (green). Hot planets are red and cold planets are blue. Note that planets in the HZ are close to the 'Solar Flux' line. Click the image for larger version (warning, large graphic).
Interactive web version of the plot above. Those exoplanets in the warm zone (i.e. habitable zone) are shown in green with those potentially habitable (i.e. < 2.5 Earth radii) in a darker shade of green (see legend top right).