The planet often considered as the earth's twin because of their close similarity in size, mass and density is

The planet often considered as the Earth's twin because of their close similarity in size, mass, and density is Venus. Venus is a terrestrial planet like Earth, meaning it is composed of rocks and metals with a solid surface. It is the second planet from the sun and is only slightly smaller than Earth. The similarity between Venus and Earth's size and density makes it a popular subject of study for scientists interested in comparing the two planets.