What is it like at the edge of the universe? If the universe is expanding, then if you were to be close to the edge of that expansion, what would it look like? What would be happening? Would it be chaotic? Would objects be appearing or disappearing? I don't even know if it's possible to have any knowledge of this, but I'd like to know if there are any theories.
The edge of the Universe in space-time can only be the moment of its creation (or end if the Universe is closed). What it would be like at that time depends on what you would consider close to the edge. Your question is about the edge of the expansion so I will presume that you mean during the Inflationary era (until about $10^{-32}\textrm{s}$ after the creation of the Universe).

There would be no objects as matter as we know it today did not exist (according to the big bang model). The major interacting forces (gravity, strong and weak nuclear force, and the electromagnetic force) were unified at the time of the Inflationary era. There would be no protons or neutrons as the strong interaction has not decoupled yet from the other forces. The temperature would be extremely high $&gt;10^{27}\textrm{K}$.