What propels itIt isn’t really propelled, it propagates. Can help to think about the way a wave travels down a rope, the rope doesn’t move forward, just the rope moving up and down.
In the case of light it’s the electric and magnetic fields going up and down.
how does light on the right hand side of a flame know to go one way and light on the other side know to go the other way ?It doesn’t. From a candle flame it goes out in all directions, unlike sheep.
does it start off slow and then accelerate to CNot as far as we know. Being massless it isn’t a problem to go straight to c.
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