Computer is Fixed, Light-Cone is Uploaded...

 

So, sorry for the hiatus, luckily my computer is as good as new (or as new as it gets, it's a 6 year old laptop!)
and hopefully this picture upload will work now because the problem was fixed!
This is a light-cone diagram (or graph, whatever) that has three dimensions. The y-axis is Time, and the x axis is Space (the one pointing right) and the z axis is Speed it takes the light to get there.
You know how when light travels, it physically makes a cone-shape if it's not distorted by hitting an object?
Well, this diagram is kind of cool because it's in the shape of a cone just like how photons are actually sent out.
But what this represents exactly, is each point inside the cone is an event somewhere in space, and the higher it is on the graph, the longer it takes light to reach/effect it. The farther out it is in the cone, the farther it is from the light in light-years.
The reason why it says "Not Allowed" for an event outside the light-cone is that according to scientists (for whatever reason) nothing can go faster than the speed of light. (Which I disagree with...)
So every single point inside the cone is something happening in space, whether it be a supernova, a star being born, or a planet's orbit changing slightly.
Now, I was reading some more Hawking, and I STILL don't understand why scientists assume that everything cannot go faster than the speed of light. Why should the universe have a limit to the speed of matter?
What about antimatter? Would this be able to go faster than the speed of light???
I mean, maybe regular matter goes near the speed of light for an amount of time so that its mass becomes distorted (because the faster you go, the more mass you gain - for whatever reason...)
and the ending result is antimatter!
But have we actually measured this special relativity? Does the mass really grow in size?
Actually, yes, I'm pretty sure Einstein tested this out and it worked on a smaller scale...
Well, probably. I actually don't know much about how he came up with that fact that the mass becomes larger.. I feel like he just randomly made up the formula and said "SEE - YOU CANT GO FASTER THAN THE SPEED OF LIGHT, ITS MATHEMATICALLY IMPOSSIBLE!" and then later thought about it over tea and said "SEE - YOU GAIN MASS THE FASTER YOU GO, TOO!"
Ladies and gentlemen, that was the birth of the special relativity formula. Putting random numbers with a radical and the speed of light together and seeing what it comes up with.

Well, on Einstein's behalf, I actually have no idea... He probably figured it out when they were testing why clocks go slower near the speed of light and found out that the clock actually gained mass or something.

In any case, enjoy the light-cone and feel free to ask questions if you're confused!