Question: How did gravity in our universe start to take effect?

Alessandro Guazzi answered on 13 Mar 2013:

According to our current scientific best guess, this happened between 10^–43 seconds and 10^–36 seconds after the Big Bang. Before that the four main forces of the universe as we currently know them (electromagnetism, gravity, the strong nuclear force and the weak nuclear force) were all unified in one, and at that point the universe had cooled down to a point where gravity started acting independently. How that happened is really beyond me!