HD 40307g
HD 40307g is twice the size of the Earth in volume. Scientists still are not certain whether it has thick layers of gas and ice or has a rocky surface. Nevertheless, the gravitational pull here is way stronger than Earth.
HD 40307g is twice the size of the Earth in volume. Scientists still are not certain whether it has thick layers of gas and ice or has a rocky surface. Nevertheless, the gravitational pull here is way stronger than Earth.