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  1. www.space.com › 18647-how-big-is-mercuryHow Big is Mercury? The Size Is Changing and Here's Why | Space

    Oct 6, 2020 · Mercury's diameter is 3,030 miles (4,878 km), comparable to the size of the continental United States. This makes it about two-fifths the size of Earth. It is smaller than Jupiter's moon...

  2. en.wikipedia.org › wiki › Mercury_(planet)Mercury (planet) - Wikipedia

    The surface of Mercury is heavily cratered, as a result of countless impact events that have accumulated over billions of years. Its largest crater, Caloris Planitia, has a diameter of 1,550 km (960 mi) and one-third the diameter of the planet (4,880 km or 3,030 mi).

  3. www.britannica.com › place › Mercury-planetMercury | Facts, Color, Size, & Symbol | Britannica

    Jun 3, 2024 · Mercury, the innermost planet of the solar system and the eighth in size and mass. Its closeness to the Sun and its smallness make it the most elusive of the planets visible to the unaided eye.

  4. science.nasa.gov › mercury › factsMercury: Facts - NASA Science

    The smallest planet in our solar system and nearest to the Sun, Mercury is only slightly larger than Earth's Moon. From the surface of Mercury, the Sun would appear more than three times as large as it does when viewed from Earth, and the sunlight would be as much as seven times brighter.

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  6. www.astronomy.com › science › mercuryMercury: Size, distance from the Sun, orbit | Astronomy.com

    Oct 20, 2023 · Size: Mercury is about 3,032 miles (4,880 kilometers) across. That makes it the smallest planet in the solar system. In fact, Mercury is just a little larger than Earth’s Moon.

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

    May 15, 2022 · With a diameter of about 3,032 miles (4,880 kilometers), Mercury is less than half the size of Earth, which is about 7,926 miles (12,756 km) in diameter. But what Mercury lacks in size, it...

  8. nssdc.gsfc.nasa.gov › planetary › factsheetMercury Fact Sheet - NSSDCA

    Jan 11, 2024 · Surface pressure: <~5 x 10-15 bar (0.005 picobar) Average temperature: 440 K (167 C) (590-725 K, sunward side) Total mass of atmosphere: <~10000 kg Atmospheric composition (Column abundances in 10 6 per cm 2): Sodium 12,000-200,000; Magnesium 100,000; Oxygen <40,000; Hydrogen 5000, Potassium 800-1300, Calcium 300-1000; Iron <300; Aluminum 15 ...

  9. science.nasa.gov › mercuryMercury - NASA Science

    Mercury—the smallest planet in our solar system and nearest to the Sun—is only slightly larger than Earth's Moon. Its surface is covered in tens of thousands of impact craters.

  10. www.nationalgeographic.com › science › articlePlanet Mercury, explained - National Geographic

    Oct 19, 2018 · The planet can pass as close as 29 million miles and as far away as 43 million miles. Living up to its name, Mercury is the fastest planet in the solar system, speeding along at about 29...

  11. science.nasa.gov › solar-system › planet-sizes-and-locations-in-our-solar-systemPlanet Sizes and Locations in Our Solar System - NASA Science

    Mar 29, 2024 · 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, orbiting at an average distance of 36 million miles (58 million kilometers).

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