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## Homework Statement

**Question number 1:**

I have read in my text book that absolute potential energy is

U= - Gmm/R

Now , my question is that if two bodies/particles are at a distance of 0.00008m or very close to each other so that the distance between them is nearly equal to zero , we will nee infinite amount if energy to separate them .

thus , U=∞

so how could particles at big bang separated then?

**Question number 2:**

In our text book , I have read that 80% of the mass of our universe comprises of Plasma , While surfing internet , I have read that 80% comprise of black matter.

My question is how black matter and plasma are interrelated?

Waiting for answers , thanks

## Homework Equations

U= - Gmm/R