Flexi Says: Of the planets in our solar system, Venus is most similar to Earth in size and density. Venus is also our nearest neighbor. The planet’s interior structure is similar to Earth’s with a large iron core and a silicate mantle. But the resemblance between the two inner planets ends there. The atmospheres of Earth and Venus are very different. Venus' atmosphere has a runaway greenhouse effect that makes for extremely hot surface temperatures that are inhospitable for life.
