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  2. Mercury Fact Sheet - NSSDCA

    nssdc.gsfc.nasa.gov/planetary/factsheet/mercuryfact.html

    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; ...

  3. Mercury is the smallest planet in the Solar System. One of five planets visible with the naked eye a, Mercury is just 4,879 Kilometres across its equator, compared with 12,742 Kilometres for the Earth. Mercury is the second densest planet. Even though the planet is small, Mercury is very dense.

  4. Mercury Facts - Science@NASA

    science.nasa.gov/mercury/facts

    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.

  5. Mercury - World Health Organization (WHO)

    www.who.int/news-room/fact-sheets/detail/mercury-and-health

    WHO fact sheet on mercury and health: includes key facts, definitions, exposure, health effects, measures to reduce exposure, WHO response.

  6. Mercury | Facts, Color, Size, & Symbol | Britannica

    www.britannica.com/place/Mercury-planet

    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.

  7. Mercury - NASA Science

    science.nasa.gov/mercury

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

  8. Mercury and Your Health. Mercury is a naturally occurring element. Its distribution in the environment is the result of both natural and man-made processes. There are three categories of mercury with unique characteristics and unique potential health effects.

  9. Mercury - NSSDCA

    nssdc.gsfc.nasa.gov/planetary/planets/mercurypage.html

    Mercury Feature Names and Locations. Planetary Positions. Terrestrial Planet Mileage Guide. The Voyage of Mariner 10: Mission to Venus and Mercury. Atlas of Mercury. More about Mercury. NSSDCA Lunar & Planetary Science: Mercury Page.

  10. Mercury (planet) - Wikipedia

    en.wikipedia.org/wiki/Mercury_(planet)

    Mercury is the first planet from the Sun and the smallest in the Solar System. In English, it is named after the ancient Roman god Mercurius (Mercury), god of commerce and communication, and the messenger of the gods. Mercury is classified as a terrestrial planet, with roughly the same surface gravity as Mars.

  11. MERCURY - NSSDCA

    nssdc.gsfc.nasa.gov/planetary/education/schoolyard_ss/sss_mercury.html

    MERCURY Actual Diameter - 3,029 mi. Scaled Diameter - 0.001 in. Actual Distance - 36,000,000 mi. Scaled Distance - 0' 11"