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    Moon - Wikipedia

    The Moon is Earth's only natural satellite. It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Tidal forces between Earth and the Moon have synchronized the Moon's orbital period (lunar month) with its rotation period (lunar day) at 29.5 Earth days, causing the same … See more

    The usual English proper name for Earth's natural satellite is simply Moon, with a capital M. The noun moon is derived from Old English mōna, which (like all its Germanic cognates) … See more

    Natural history image
    Physical characteristics image

    The Moon is a very slightly scalene ellipsoid due to tidal stretching, with its long axis displaced 30° from facing the Earth, due to … See more

    Position and appearance image

    Pre-telescopic observation (before 1609)
    It is believed by some that the oldest cave paintings from up to 40,000 BP of bulls and geometric shapes, or 20–30,000 year old tally sticks were used to observe the phases of the Moon, keeping time using the waxing and … See more

    History of exploration and human presence image
    Overview image

    Lunar geologic timescale
    The lunar geological periods are named after their characteristic features, from most See more

    Earth–Moon system image

    Orbit
    The Earth and the Moon form the Earth-Moon satellite system with a shared center of mass, or barycenter. This barycenter is 1,700 km (1,100 mi) (about a quarter of Earth's radius) beneath the Earth's surface. See more

    The Moon's highest altitude at culmination varies by its lunar phase, or more correctly its orbital position, and time of the year, or more correctly the position of the Earth's axis. The full moon is highest in the sky during winter and lowest during summer (for each … See more

    In 1959 the first extraterrestrial probes reached the Moon (Luna program), just a year into the space age, after the first ever orbital flight. Since then humans have sent a range of probes and people to the Moon. The first stay of people on the Moon was conducted in 1969, … See more

     
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  2. Moon | Features, Phases, Surface, Exploration, & Facts | Britannica

  3. The moon is Earth's only natural satellite and the fifth largest in the solar system
    Moon: Earth's Natural Satellite
    The moon is Earth's only natural satellite and the fifth largest in the solar system, orbiting about 240,000 miles away
    Image: Getty Images
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  4. In Depth | Earth's Moon – NASA Solar System Exploration

  5. All About the Moon | NASA Space Place – NASA Science for Kids

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