Space, in the context of outer space or interstellar regions, is mostly a vacuum, meaning it has an extremely low density of matter. While there may be sparse particles and gas clouds present in space, the density is far too low to support the transmission of sound waves in the same way as in a terrestrial environment.
Sound waves require a medium, such as air, water, or solids, to propagate because they rely on the physical interaction and transfer of energy between particles in the medium. In terrestrial environments, sound waves travel by causing compressions and rarefactions in the medium, and these variations in pressure are detected by our ears as sound.
In the vacuum of space, the lack of a sufficient medium means that sound waves cannot propagate and be transmitted. There are simply not enough particles in space to carry and transfer the mechanical vibrations that constitute sound waves.
However, it is worth noting that space is not completely devoid of any particles. There are extremely low-density particles and gases present in space, such as those found in interstellar mediums or the solar wind. In theory, if you were close enough to such a source, you might be able to detect sound waves generated by those particles. However, the sound would be very different from what we are familiar with on Earth, and it would not be audible to the human ear without specialized equipment due to the extremely low pressure and frequency range involved.
In summary, the absence of a dense medium in the vacuum of space prevents the transmission of sound waves as we know them on Earth, making it impossible for us to hear sound in space under normal circumstances.