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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 at 29.5 Earth days, causing the same side of the Moon to always face Earth.
The distance to the moon was measured by means of radar first in 1946 as part of Project Diana. [44] Later, an experiment was conducted in 1957 at the U.S. Naval Research Laboratory that used the echo from radar signals to determine the Earth-Moon distance. Radar pulses lasting 2 μs were broadcast from a 50-foot (15 m) diameter radio dish ...
moon of Earth (terrestrial) prehistoric: Europa Jupiter II: 1 560.8 ...
Sepharial claimed that Lilith was a "dark" moon invisible for most of the time, but he claimed to be the first person in history to view it as it crossed the Sun. [18] In 1926, the science journal Die Sterne published the findings of amateur German astronomer W. Spill, who claimed to have successfully viewed a second moon orbiting Earth. [12]: 148
A true mini-moon would fully orbit Earth at least one time. The 2024 PT5 won't complete a perfect full orbit. In his article, Carlos, the researcher, said the asteroid would instead follow a ...
In order to be considered a "mini-moon," an incoming object must reach Earth at a range around 2.8 million miles and at a steady space of about 2,200 mph, according to Marcos. ... How big is the ...
The so-called mini moon will be overwhelmed by ... It will pass as close as 1.1 million miles of Earth in January, maintaining a safe distance before it zooms farther into the solar system while ...
Earth is orbited by one permanent natural satellite, the Moon, which orbits Earth at 384,400 km (1.28 light seconds) and is roughly a quarter as wide as Earth. The Moon's gravity helps stabilize Earth's axis, causes tides and gradually slows Earth's rotation. Tidal locking has made the Moon always face Earth with the same side.