Humans can't hear sound in space because sound requires a medium to travel through, and space is mostly a vacuum with extremely low matter density. Sound is a mechanical wave that propagates through the vibration of molecules or particles in a medium, such as air, water, or solid objects.
In Earth's atmosphere, sound waves are created when an object vibrates and causes the air molecules around it to vibrate as well. These vibrations then travel as pressure waves, which our ears detect and interpret as sound.
In space, however, the lack of a significant medium means there are very few particles available for sound to travel through. While space is not entirely empty, the interstellar medium's density is so low that the vibrations from sound waves can't propagate effectively over long distances. The few particles present are far apart, and there is no continuous medium like air to carry the sound waves.
Therefore, if you were in space and someone banged a drum or made any other loud noise, you wouldn't hear it because there is no air or other medium to carry the sound waves to your ears. Instead, you would only perceive vibrations through the objects directly in contact with you, such as your spacesuit or spacecraft, but not through the surrounding vacuum.