Size, Mass, and Orbits:Because of its similar size, mass, proximity to the Sun, and composition, Venus is often referred to the u.s. Earth's "sister planet". With a mass of 4.8676 × 1024 kg, a surface area of 4.60 x 108 km², and a volume of 9.28 × 1018 km3, Venus is 50.6% us massive u.s. Earth, and has 90% of its surface area and 86.6% of its volume.Venus orbits the Sun at an average distance of about 0.72 AU (108,000, 000 km/67,000, 000 mi) with almost no eccentricity. In fact, with its farthest orbit (aphelion) of 0.728 AU (108,939, 000 km) and orbit closest (perihelion) of 0.718 AU (107,477, 000 km), it has the most circular orbit of any planet in the Solar System.
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