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Radio waves propagate in vacuum at the speed of light c, exactly 299,792,458 m/s.Propagation time to the Moon and back ranges from 2.4 to 2.7 seconds, with an average of 2.56 seconds (the average distance from Earth to the Moon is 384,400 km).
[20] [21] By that time, Earth and the Moon would be in a mutual spin–orbit resonance or tidal locking, in which the Moon will orbit Earth in about 47 days (currently 27 days), and both the Moon and Earth would rotate around their axes in the same time, always facing each other with the same side. This has already happened to the Moon—the ...
The fluid core of the Moon was detected from the effects of core/mantle boundary dissipation. [44] The Moon has free physical librations that require one or more stimulating mechanisms. [45] Tidal dissipation in the Moon depends on tidal frequency. [42] The Moon probably has a liquid core of about 20% of the Moon's radius. [11]
Timekeeping on the Moon is an issue of synchronized human activity on the Moon and contact with such. The two main differences to timekeeping on Earth is the length of a day on the Moon, being the lunar day or lunar month, observable from Earth as the lunar phases, and the differences between Earth and the Moon of how differently fast time progresses, with 24 hours on the Moon being 58.7 ...
Daily (or Earth's rotation frequency) 10 −4: 100 μHz ~277.8 μHz: Hourly 10 −2: 1 centihertz (cHz) ~16.667 mHz: One rpm: 10 −1: 1 decihertz (dHz) 189 mHz: Acoustic – frequency of G −7, the lowest note sung by the singer with the deepest voice in the world, Tim Storms. His vocal cords vibrate 1 time every 5.29 seconds. 10 0: 1 hertz ...
The Lunar Communications Relay Unit (LCRU) on the Lunar Rover (Apollo 15, 16, 17) had its own downlink frequency (to avoid interference with the LM) but shared the LM's uplink frequency as it did not implement a coherent transponder. Separate voice subcarriers were used on the common S-band uplink, 30 kHz for the LM and 124 kHz for the LCRU, so ...
The Earth will gain a second, mini-moon on Sept. 29, but it won't stick around too long, USA TODAY reports. The asteroid 2024 PT5 is expected to escape Earth's orbit on Nov. 25 and be pulled ...
At the new and full moon, the Sun and Moon are in syzygy. Their tidal forces act to reinforce each other, and the ocean both rises higher and falls lower than the average. [ 6 ] Tidal variations can also be measured in the Earth's crust , and these Earth tide influences may affect the frequency of earthquakes .