The e=mc2 is applicable the within first sky... Or its Applicable after 7 skies. The first sky is beautiful and decorated with stars. Just imagine rest of the skies.

We don't know what was in Einstein Mind. If he Could have believed in 7 skies as the Vibgyor demonstrates very often to human beings as there are 7 skies above the Head... Then Einstein could have been correct if he believed so.
As long as Einstein Was alive everyone use to mock him. After his death they used to pick all his papers and said he is correct. He needs just one pencil and paper and GOD taught him the New Langauge e= mc2.