In science, what light is should explain what it does but even after centuries of study, physics still can’t explain why light:
1. Doesn’t fade. All physical waves fade over time by friction but light doesn’t, as a photon from a distant star that has traveled for millions of years still produces a dot on a screen.
2. Has a constant speed. The speed of a wave depends on the medium it travels through, but light travels at a constant speed in empty space for no apparent reason.
3. Is like a wave and a particle. Waves aren’t particles nor are particles waves, but light is sometimes like a wave and sometimes like a particle, which doesn’t make sense.
4. Always takes the fastest path. A particle can’t know the fastest path to any destination in advance, but light always finds that path, somehow.
5. Defines its path when it arrives. A particle can’t pick the path it took to a destination when it arrives but light seems to do just that, which is very strange.
6. Can reveal an object it didn’t physically touch. In a purely physical world, it should be impossible to detect an object without touching it, but light can do exactly that.
7. Seems to vibrate outside space. Light waves vibrate as other waves do, but according to the equations that describe it, do so in a dimension outside our space, which is odd.
Current physics describes light as an electro-magnetic wave made of photon particles, but how can it be both? A water wave doesn’t arrive at a point like a particle, but a photon does. A particle doesn’t take many paths at once like a wave, but light seems to. Physical waves don’t act like particles and particles don’t act like waves, so surely science can decide if light is a particle or a wave?