# Is it possible to hear the past?

From this Stack Exchange Physics Post, I am certain that it is possible to view the past.

But then this interesting question came to me.

Is it possible to hear the past?

Ok, you might say, "Well, we are hearing the past, aren't we?" and go onto immense details about the speed of sound against the difference and stuff.

But what if I wanted to hear the sound of a place extremely close by days, weeks, months or even years back?

Would that be possible?

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Could you please be more specific? Surely every time we hear something, we hear the past. We hear what happened $t=s/v$ time earlier where $s$ is the distance of the source and $v$ is the speed of sound. For example, thunder is heard when the actual event, the lightning, is already several seconds in the past. It's increasingly hard for sound to propagate over too long distances $s$ because there's not enough medium for sound to propagate (sound goes around equator in 2 hr) - no air outside the earth etc; and because the sound weakens as it propagates. But in principle, we may hear the past. – Luboš Motl Sep 23 '12 at 7:04
@LubošMotl I mean like, days, weeks, months or even years back, from the exact same or similar location. Check my edit. – think123 Sep 23 '12 at 9:06