What is the smallest planet in our solar system?
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Mercury is the smallest planet in our solar system. Mercury is a little more than one-third the width of Earth, and has an equatorial diameter of about 3,032 miles (4,880 kilometers).
Mercury is the closest planet to the Sun and has a diameter of about 4,880 kilometers (3,032 miles), making it the smallest planet in our solar system. Its proximity to the Sun gives it extreme temperature variations, with daytime temperatures reaching up to 430°C (800°F) and nighttime temperatures plummeting to -180°C (-290°F). Despite its small size, Mercury has a significant gravitational pull, due to its dense, iron-rich core. It also lacks an atmosphere to retain heat, contributing to its drastic temperature changes.