Sound From a Super Nova

Let's say there exists an alternate reality from ours that is identical in every aspect save for one. There exists a substance in space that allows for the transmission of sound. Let's call this substance aether.

Aether has sound transmission qualities identical to the atmosphere here on Earth. You can't breathe it, it acts very identically the to the vacuum of space we have in our reality except for sound transmission. As far as acoustics it would be similar to that of an open plain since there isn't really much out there to echo off of.

Super novae are (usually) very far from our planet however they are also extremely energetic. Massive amounts of energy are expelled in tremendous explosions.

My question is, at what distance would the inhabitants of alternate Earth be able to hear a super nova if the sound was transmitted through the aether and to our atmosphere? Are there any stars close enough excluding our own?

EDIT: In response to @Frostfyre's comment, the aether will be as dense as it needs to be to have identical sound transmission speed to the atmosphere of Earth.

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Sound From a Super Nova

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