These are some star systems that contain exoplanets. Some might even be be habitable! Click C to center on the star, click O to turn on its orbit, or click G to travel through space and go there! We'll even show you an artist's rendering of the exoplanet.
| Potentially Habitable Exoplanets | |||||
| Name | pClass1 | ESI2 | Center | Go There | |
| HD 40307 g | Warm Superterrran | 0.73 | C | G | |
| Kepler-21 b | Hot Superterrran | 0.27 | C | G | |
| 61 Virginis b | Hot Neptunian | 0.27 | C | G | |
| HD 47186 c | Cold Jovian | 0.31 | C | G | |
| 55 Cnc f | Warm Jovian | 0.59 | C | G | |
| tau Cet e | Warm Superterrran | 0.77 | C | G | |
1The pClass classifies planetary bodies with a combination of three thermal zones and seven mass categories. The thermal zones are hot, warm, and cold. They are related to the orbital position of the body with respect to the Habitable Zone (HZ), warm being the HZ. The mass divisions are asteroidan, mercurian, subterran, terran, superterran, neptunian, and jovian. The classification can be used for any solar planets and exoplanets including moons.
2The ESI or the "easy scale," measures how similar planets are to Earth in a scale from zero to one, with one being identical to Earth. ESI values between 0.8 and 1.0 correspond to Earth-like planets with a rocky composition that is able to hold a terrestrial atmosphere under temperate conditions. The ESI is a function of the planet's radius, density, escape velocity, and surface temperature.
This was the first planet discovered around a sun-like star. 51 Pegasi is 50 light-years away and 0.46 times the mass of Jupiter. It orbits its star in only 4.23 days at an average distance of 0.05 AU. (Mercury, the closest planet to the sun in our solar system, makes a complete orbit in 88 days.)