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

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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.