2. Yes, sound is simply vibrations traveling through matter. But how you would have sound in space eludes me, because despite what Hollywood depicts, there isn't any matter in the vacuum of space for sound waves to travel through.
3. Going the speed of light, according to Einstein's theory of special relativity, is impossible for matter. However, going near the speed of light is theoretically possible (say 99.9% of the speed of light), but would require a tremendous amount of energy (think all the energy in the universe together should do the trick).
4. As I have said before, photons (which is light), isn't fully understood. However, other forms of EM Radiation can travel at the speed of light (sound cannot, but if it were to travel through a ludicrously hot plasma [think 10^10000 degrees, that may be possible).
5. Umm... Well, this is the way science works like it or not. This is why it takes intelligent people to be physicists, because normal people can't even conceive what others have proven, let alone come up with their own ideas.
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Say we are able to use a tremendous amount of energy to fire 1 tiny hydrogen atom at the speed of light. Does the electron stop spinning around the nucleus? because if it did it would exceed c
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Also everyone was saying(even the one professor in the room) how time travel is actually within our grasp now, and we could do it if we wanted. Something to do with this one scientists invention that involved tons of weird lazers going up a spiral(like a stack of CDs) and that if you launched something down the center of it, it would pop out in time the very moment you turned it on. I asked what happened when they tried it and they told me the inventor was "too scared to turn it on, because of the things he might see written on the notes, probably telling him how to build a better one" I was like, thats a load of bs, but everyone else was like "no" treating like an established fact. I'm gonna google w/e I can find out about it right now, but if anyone has any insight on this, post up.
None.