Which two planets are most alike in size?
In absolute terms Venus and Earth are the closest in size but in proportion to the size of the planets under comparison Uranus and Neptune are closest (Neptune is 96.5% of Uranus’s size vs Venus which is 95.0% of Earth’s size). Added to that in astronomy “size” frequently means “mass”. Here the situation for the gas giants is again the masses are closer together by proportion if not in absolute terms. However, Neptune is actually the heavier of the two. This means that the question of which of Neptune and Uranus is larger depends on the exact semantics of the question. This tends to suggest again that they are broadly comparable.
