According to my revision guide we can calculate the critical density of the universe using the equation
ρ0=8πG3H02 but surely as this uses Hubble's constant (and the fact that it's
ρ0 not
ρc) then this is finding the density of our universe, not the critical density? Or am I getting it all mixed up? Either way
ρc=ρ0 to give us a flat universe supposedly, but I don't understand which one I'm finding!
Edit: Just checked and in the textbook it's down as
ρc in the equation and in the formula booklet it's
ρ0... Now I'm even more confused
Posted from TSR Mobile