Physicists are debating/thinking/exploring to knw the shape n size of the universe ,even they are assuming about parallel universe.In eastern ancient philosophy of Vedanta there is discussion about the universe.All the physical phenomenological existences(Satta) included in universe(Brahmanda) so if anything will exist physically outside our so called universe is to be the component of the universe what we r saying universe at present is to be renamed .Physics has been calculating it’s size n shape in giga parsecs but each n every moments size is increasing ,so,it is difficult /impossible to get the xact size but not beyond the human assumptions.How much the universe expands the venue for expansion i.e. space-time singularity is available ,this space called Disha in Veda is infinite(Neti Neti-endless n infinite); where presence of light, fastest physical xistence, ends there won’t be void of everything there is of course black space(Tama Ashit-RigVeda) but it will be full of monistic omnipresent ultimate existence called Brahma .