Hobs

Hello Dear Scientists, I kindly ask for your patience with me as Im no scientist, but I'm learning. I have a few questions here. Today I came across this video on the BBC: http://www.bbc.com/earth/story/20161021-why-there-could-be-many-copies-of-you The scientist in this documentary says that the cosmos is eternal. But it cannot be according to basic scientific theory and understanding: a) Matter cannot be created. It is finite. Do we agree on this, or have I misunderstood the 1st law of Conservation of matter: According to the law of conservation of matter, matter is neither created nor destroyed, so we must have the same number and type of atoms after the chemical change as were present before the chemical change If matter cannot be created - then there is a finite (given quantity) of matter to begin with. The Cosmos cannot be eternal because matter is not being created. If matter could continually be created, then sure, we agree - the cosmos would or could be eternal. In fact, if I'm, not mistaken, there are scientific theories pertaining to the boundary of the universe. I.e. that the Universe is finite, and hence, the universe must have a boundary. b) for the cosmos to be eternal, it means time would have to be eternal. We know that time cannot be eternal. Is that correct? Thanks for your answers.