We discuss the evolution of the Universe from what might be called its quantum origin .
We apply the uncertainty principle to the origin of the Universe with characteristic time scale equal to the Planck time to obtain its initial temperature and density .
We establish that the subsequent evolution obeying the Einstein equation gives the present temperature of the microwave background close to the observed value .
The same origin allows the possibility that the Universe started with exactly the critical density , \Omega = 1 , and remained at the critical density during evolution .
Many other important features of the observed Universe , including homogeneity and isotropy , Hubble ’ s constant at origin , its minimum age , present density etc .
are all predictions of our theory .
We discuss also the testability of our theory .