why is there no sound on the moon
Sound needs a medium to carry it. Usually, what we call sound is a series of compression waves that arrive at the eardrum through the air. No air on the. Sound needs a medium to carry it. Usually, what we call sound is a series of compression waves that arrive at the eardrum through the air. No air on the Moon = no sound under this definition. It is possible for sound to travel through other media, if they can carry the waves. If one astronaut stands on a very large rock while another astronaut, hundreds of feet away, hammers away at the same rock, the sound waves may travel through the rock, cause the foot pads of the suit to vibrate and this vibration could end us as sound inside the suit.
If the listening astronaut is lying on the ground with her faceplate touching the rock surface and her skull touching the face plate, she (or he) could hear through the bones (the head bones are welded together and close enough to the very small bones that take the vibrations of the eardrum and transform them into signals for the brain to interpret as sound). Seismic detectors are, in most cases, sound detectors that are sensible to very low frequency sounds (frequencies we can t hear). Some were left on the Moon and they listen to Moonquakes.
FYI the, has about five particles per cubic centimeter in the vicinity of Earth s orbit, decreasing as the inverse square of the distance from the Sun.
According to, the Lunar atmosphere has something less than one million particles per cc, which is about the same as the density of Earth s atmosphere at the height of the International Space Station (which is considered space ). I quote: However the moon s atmosphere is so thin, atoms and molecules almost never collide. Instead, they are free to follow arcing paths determined by the energy they received from the processes described above and by the gravitational pull of the moon.
Essentially every particle in the Moon s atmosphere is orbiting the Moon independently. Since sound is by definition density waves carried by collisions between particles, There ain t no sound. OTOH, this extremely thin atmosphere is orbiting the moon, i. e. zipping past any stationary object. So a sufficiently extremely quiet and sensitive instrument might be able to sense the white noise caused by these particles colliding with it as they go by in their orbits. But that s sound generated within the instrument and not carried away.
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