Joonis 203. Distribution of eccentricity of exoplanet orbits (recall section 3.2.1) depending on orbital period. The eccentricities of the orbits of the planets of the solar system are also given for comparison. The exoplanet with the most eccentric orbit known so far is marked separately. We can see that the orbits of quite a few exoplanets are quite elongated. Source: https://www.ias.edu/ideas/2012/socrates-extrasolar-planets