# Propagation of pressure waves in Low Earth orbit

At higher altitudes, where air drag is less significant, orbital decay takes longer. Slight atmospheric drag, lunar perturbations, Earth's gravity perturbations, solar wind and solar radiation pressure can gradually bring debris down to lower altitudes (where it decays), but at very high altitudes this may take millennia.[16]

Since debris decays at lower altitudes (presumably LEO)there has to be a mildly dense medium of matter/gas in that altitude.So if there is a medium then energy can flow through it since it is not really vaccum.

Can pressure waves(like sound waves) flow in LEO?

• Perhaps you should distinguish between "sound" and "pressure" waves. If you mean "sound" in the sense of a pressure wave in gas that might be audible to a human [or other animal's] ear, then this is one sort of question. If you mean "sound" as in any measurable pressure wave, this is another sort of question. (Both questions are very interesting I think! :) – Craig Constantine Apr 29 '18 at 13:10
• This is a different question, but there is a bit of overlap Can astronauts hear sounds during space walks for repairs? – uhoh Apr 29 '18 at 16:05