First Earth-sized planets beyond Solar System reported

The two plan­ets, dubbed Kep­ler-20e and 20f, are the small­est plan­ets found to date. They are 6,900 miles and 8,200 miles wide — equiv­a­lent to 0.87 times Earth, or slightly smaller than Ve­nus, and 1.03 times Earth. They are ex­pected to have rocky make­ups. Both worlds cir­cle Kep­ler-20, a star slightly cool­er than the Sun and lo­cat­ed 950 light-years from Earth. (It would take the space shut­tle 36 mil­lion years to trav­el to Kep­ler-20.)