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A moon is a natural satellite consisting of solid material that naturally orbits a planet or dwarf planet. Although the Earth has just one moon, there are other planets that have more, and some that even have none. Moons and their planets often have very symbiotic, or close relationships.


There are eight different phases or "types" of the moon: new, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, last quarter and waning crescent. These phases repeat themselves approximately every 29.5 days.


There are 146 official moons in the solar system. This does not include the 27 additional celestial objects orbiting planets, the five moons orbiting the dwarf planet Pluto or the tiny moons orbiting celestial bodies other than planets and the asteroids.


Most people know that the moon's gravitational influence has an effect on the tides on Earth, but some scientists also believe that the presence of the moon played an important role in making Earth habitable to begin with. The interplay between the Earth and the moon mirrors events that occurred thr


Earth's sole natural satellite, the moon, has a circumference of 6,783.5 miles around its equator. Its surface area is 14,647,439.75 square miles, which is approximately 0.07 times that of the Earth.


The moon completes one orbit around Earth with respect to the distant stars every 27.5 days. This constitutes a sidereal month. In contrast, the lunar cycle of 29.5 days is called a synodic month. It takes the moon an additional 2 days to begin a new lunar cycle because Earth is not stationary in sp


Neil Armstrong was the first person to walk on the moon on July 20, 1969. He was an astronaut on the Apollo 11 mission, which had the goal to land two men on the moon.


The most popular theory regarding lunar formation is that a Mars-sized planetoid slammed into the Earth and flung molten debris into orbit around 40 million years after the solar system was created, according to scientists at the National Aeronautics and Space Administration (NASA). This is called t


In 2006, NASA released a plan to begin traveling to the moon again by 2020, with lunar residency missions beginning in 30-day increments in 2024 and moving to six-month missions by 2025. Since then, NASA has released further projections anticipating private residential missions as early as 2020.


When the moon is full, the moon is at its brightest, and the entire disk is visible. New moons occur when the Earth comes between the moon and the sun, resulting in a moon that is completely obscured by the Earth's shadow and is barely visible in the night sky.