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    Science Mission Directorate
    https://science.nasa.gov › mercury › facts

    Mercury Facts - Science@NASA

    • Mercury's environment is not conducive to life as we know it. The temperatures and solar radiation that characterize this planet are most likely too extreme for organisms to adapt to.… 展开

    Size and Distance

    With a radius of 1,516 miles (2,440 kilometers), Mercury is a little more than 1/3 the width of Earth. If Earth were the size of a nickel, Mercury would be about as big as a blueberry. Fro… 展开

    Science Mission Directorate
    Orbit and Rotation

    Mercury's highly eccentric, egg-shaped orbit takes the planet as close as 29 million miles (47 million kilometers) and as far as 43 million miles (70 million kilometers) from the Sun. It speed… 展开

    Science Mission Directorate
    Formation

    Mercury formed about 4.5 billion years ago when gravity pulled swirling gas and dust together to form this small planet nearest the Sun. Like its fellow terrestrial planets, Mercury has a c… 展开

    Science Mission Directorate
    Structure

    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% of the planet's radius. There is … 展开

    Science Mission Directorate
    Is Mercury a suitable planet for Earth-like life?
    According to NASA, Mercury is not a suitable planet for Earth-like life. It has a surface boundary exosphere instead of a layered atmosphere, extreme temperatures, and high solar radiation. It is unlikely that any living beings can withstand those conditions.
    en.wikipedia.org