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  1. www.livescience.com › mercury-planetMercury: Facts about the smallest planet | Live Science

    May 15, 2022 · Mercury is the closest planet to the sun and the smallest planet in our solar system.With a diameter of about 3,032 miles (4,880 kilometers), Mercury is less than half the size of Earth, which is ...

  2. solarsystem.nasa.gov › planets › mercuryIn Depth | Mercury – NASA Solar System Exploration

    Mercury is the second densest planet, after Earth. It has a large metallic core with a radius of about 1,289 miles (2,074 kilometers), about 85 percent of the planet's radius. There is evidence that it is partly molten or liquid. Mercury's outer shell, comparable to Earth's outer shell (called the mantle and crust), is only about 400 kilometers ...

  3. spaceplace.nasa.gov › all-about-mercuryAll About Mercury | NASA Space Place – NASA Science for Kids

    Jun 13, 2024 · Mercury is the smallest planet in our solar system. Mercury is a terrestrial planet. It is small and rocky. Mercury has a thin exosphere. Mercury’s surface can be as hot as 800 degrees F during the daytime and as cold as -300 degrees F during the nighttime. (But Mercury is not the hottest planet in the solar system.

  4. theplanets.org › mercuryMercury Facts For Kids, Students and Everyone Else - The Planets

    Mercury is the smallest planet in the solar system with a diameter of 4,879 km and is one of five planets that is visible to the naked eye. After the Earth, Mercury is the second densest planet. Despite its small size, Mercury is very dense because it is composed mainly of heavy metals and rock – the main characteristic of terrestrial planets.

  5. science.nasa.gov › solar-system › planetsPlanets - NASA Science

    The solar system has eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. There are five officially recognized dwarf planets in our solar ...

  6. nineplanets.org › mercuryMercury Facts | Information, History, Location, Size & Definition

    Sep 25, 2019 · This paradoxically makes Mercury the closest planet to Earth, a plurality of the time. Mercury was named after the Roman messenger god, because of its fast movements around the Sun. Mercury is the closest planet to the Sun at a distance of 57.91 million kilometers / 35.98 miles or 0.4 AU away.

  7. education.nationalgeographic.org › resource › mercury-101Mercury 101 - Education | National Geographic Society

    Oct 19, 2023 · Mercury 101. The planet Mercury is named after the messenger of the Roman gods because of its fleeting nature across the sky. Find out the reason behind its incredible speed, if it is indeed the hottest planet in the Solar System, and why the smallest planet in the solar system is slowly shrinking.