What is the reported low particle density sometimes found in the emptier interstellar medium?
Answer
One particle per cubic meter
The density of cosmic material varies dramatically depending on location, being far lower in the interstellar medium (the space between star systems) compared to the interplanetary medium near a star. While the interplanetary space might yield a few grains in a teaspoon volume, the emptiness of the interstellar medium is much more extreme. In these vast gulfs, the density can drop to an extraordinarily low figure, sometimes calculated as equating to only one single particle found within a cubic meter of space.
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