**What is it about light that makes it go the speed it does ?..I don't mean what propels it (we all know it's Light Fairies [])..I mean...why does light go at that specific speed ?**

It's not a silly question, but my answer will probably disappoint you: light's speed is

*defined* to have that value. [

] This because the metre is defined as the space travelled by light in 1/299,792,458 seconds.

Ok, but, you could ask, and before we defined the metre this way?

However, the fact light's speed in the void has a specific numerical value (299,792,458 m/s) it's not so basic, in the sense that it could have any other numerical value depending on the units of measure; infact it has also the value (not exact) of 186,282.397 miles/second, for example. Talking about a dimensional physical quantity, it's not so basic which numerical value it has (it is of course still important because when you make computations you have to know its exact value). It's basic, instead, the fact that light's speed is much greater than ordinary veichles' speed of your life AND the fact it's

*finite*.

It would be more fundamental to investigate why it has these two last properties.