Moon
The Moon is the only natural satellite of Earth. It orbits around Earth at an average distance of 384,399 kilometers (238,854 mi). A distance roughly 30 times the width of Earth.
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- Space is so big that light from distant stars takes millions of years to reach us!
- There are more stars in the universe than grains of sand on all Earth's beaches.
- A day on Venus is longer than a year on Venus!
It completes an orbit (lunar month) in relation to Earth and the Sun (synodically) every 29.5 days. The Moon and Earth are bound by gravitational attraction. Which is stronger on the sides facing each other.
The resulting tidal forces are the main driver of Earth's tides, and have pulled the Moon to always face Earth with the same near side. This tidal locking effectively synchronizes the Moon's spinning period (lunar day) to its orbital period (lunar month). In geophysical terms, the Moon is a planetary-mass object or satellite planet.
Its mass is 1.2% that of the Earth, and its width across is 3,474 km (2,159 mi). Roughly one-quarter of Earth's (about as wide as the contiguous United States). Within the Solar System, it is larger and more massive than any known dwarf planet, and the fifth-largest and fifth–most massive moon.
As well as the largest and most massive in relation to its parent planet. Its surface gravity is about one-sixth of Earth's. About half that of Mars, and the second-highest among all moons.
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