As said earlier it shows the lack of faith in our culture which well established over thousands of years. In recent time NASA brought out the sound captured by them from SUN and they mention the sound OM mentioned by hindus. Now shall one consider this as unproven theory. It is the attitude of present generation only to accept what the west dishes out while ignoring the treasure of knowledge our culture offers
Actually that's one of the 'internet folktale' or 'whatsapp university' knowledge. The problem with such messages are they mask the true knowledge and make everything as some folktale or pseudo-science.
Sun does not produce sound, nor sound moves in vacuum. Sound or acoustic vibrations are forms of mechanical energy in the auditory range, which are produced when something physically moves through in space. When scientists map the masses discharged from the center of sun, they 'map' this discharges to a frequency pattern, which looks like a hormonics and any harmonics when played in the auditory range, hears 'hmmm..' - This is what is being folktaled into Aum in whatsapp university and many psuedo-science channels.
Basically this kind of folktaling leads to ridicule in scientific circles and eventually a dis-interest in all vedic scriptures. Ofcourse present generation will accept only what west dishes out, because there is too much of non-sense floating around attributing them to our scriptures.
The praNava Aum was supposed to be the primordial sound out of which Universe came.
In reality such a primordial sound existed and seeded the Universe as we see it now. When scientists try to explain how matter aggregation happened in the early Universe, they talk about a 'sound' that emanated through the baryon-photon mix that existed in primordial universe, aggregating baryons in different regions of space and these aggregations became the 'seeds' for galaxies when Universe expanded.
They call this sound baryon acoustic oscillation.