Look a little closer
An explosion cannot send an audible movie-style boom across empty space. Ordinary sound is a mechanical wave: particles in air, water or a solid push and pull neighboring particles and pass a pressure disturbance onward.
A vibrating speaker alternately compresses and relaxes nearby air. That pattern travels through molecules until it moves an eardrum, and the brain interprets the motion as sound. Sound can also cross water or a wall because those materials contain particles that can transmit vibration.
Interplanetary space is not perfectly empty, but its particle density is extraordinarily low compared with air at Earth's surface. There is no continuous medium dense enough to deliver a useful pressure wave to an ear, so people separated by vacuum cannot directly hear one another or a distant blast.
Light and radio are different. They are electromagnetic waves, traveling changes in electric and magnetic fields, and do not require a material medium. That is why spacecraft can communicate with Earth and telescopes can receive light from distant stars.
NASA's published 'sounds of space' are not necessarily fake. Space contains plasma waves and changing electromagnetic fields around planets and stars. Instruments measure those signals, and scientists can shift or map the data into the human hearing range to make patterns audible.
Inside a spacecraft, air and solid structures let astronauts hear speech, fans and vibration. Contact through a helmet or vehicle frame can also carry mechanical energy. Space is called silent because a vacuum cannot transport ordinary airborne sound across a distance.
