The current model for the universe is not one of infinite dimensions. It's true that you can travel is a straight line and arrive at your starting point, though. Just as planets are two-dimensional surfaces wrapped around to form an unedged shape, the universe curves round in unfamiliar dimensions to form an unedged space.
I don't believe in Greys or Nordics or the United Federation of Planets coercing our governments to form a single global body in order that we might be accepted like I perhaps used to, but I do believe in the potential for extraterrestrial life to exist. However, as a biologist I recognise the possibility that it may be so alien we wouldn't even necessarily recognise it as life. My understanding is that scientists have succeeded in creating life in laboratories that doesn't conform to our typical carbon-based creatures with double-helix DNA of four-bases and a dependency on water. Hence the supposedly very good Alien World documentary seems incredibly contrived and unlikely to me.
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