Sound pressure waves attenuate pretty quickly. On Earth we can not hear much of what is going on a few kms away, or above, or underground, unless it's some really catastrophic event of huge energy. But the Sun's energy output is hugely immense compared to even the most catastrophic event on Earth. My question is, if the Solar System interplanetary space between the Sun and Earth was full of (say) gas, could we hear the Sun's noise from Earth? what kind of gas density or other properties would be required? and what kind of sound would we hear? what frequencies, what level, a more or less constant roar or some big sound explosions? Thanks!