You might as well ask ‘what is light’ at the same time. It doesn’t really have a ‘propulsive’ force. Once emitted, it moves at the speed it does unless slowed down by a medium. But once the medium’s gone, it goes back to its normal speed. Kinda like a wave in that sense. But it also has momentum and other things that make it seem like a particle; but you can’t have a particle just passing through solid objects indefinitely. Light is weird stuff that we don’t really understand why; we just understand that it is the way it is.
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