Hello everyone, i am just bothered by the theory that our universe is expanding, if so i want to know, what substance is filling the void as our universe expands, and where does this substance come from,
ARe you saying that this boundry is not fixed?You are correct that there is a boundary between the universe and the hypothetical multiverse. That boundary is the limit of causation at lightspeed for the age of the universe. Practically, it is how far we can see, the universe's horizon.
THanxThe multiverse is not known to be a fact, it's a possible explanation for some of the properties our universe has, but the existence of it has never been tested for,
Some think it cannot ever be tested for, and therefore it isn't really a scientific proposition at all.
However the expansion of the universe is a measurable fact.
... Must go now, I have visitors, I'm sure somebody else will like to assist wit your quesiton
I Think it is,logical to say that if realy the contants of the universe are moving apart and the universe is not expanding, then a few galaxies would be at that edge or outsideYou are correct that there is a boundary between the universe and the hypothetical multiverse. That boundary is the limit of causation at lightspeed for the age of the universe. Practically, it is how far we can see, the universe's horizon.
If thats the case then, whats being injected into space inorder for it to expand, i mean it cant just expand and expand, some substance has to be added into it!Actually the large structures of the universe, galaxies and clusters and super clusters, are gravitationally bound together. It is the space between them that is expanding.
No. Space i a property of big bang, remember reason why space is said to be expanding is due to.the observation that after it banged everything flew apart, but flew apart into what?What is space? Was there space before the Big Bang? Will there be space during the hypothetical Big Crunch?