Right at the moment of the Big Bang, it is said the Space & Time originated.The theory does not support them being different things. They're dimensions of spacetime, one thing, and right at the big bang event (not a moment), space dimensions were not yet distinct from time dimensions.
But what out of both of them came First?They're the same thing. There are alternate theories (theories in denial of Einstein's relativity theory) that posit them being separate things, with time being something that ticks, flows, progresses, whatever. But that's a different model than the big bang one. Such alternate views don't (cannot) support a big bang. It's more like a big bounce.
Or did Time tick first & then Space formed?
Under theory of relativity, neither space nor time cannot meaningfully exist without the other. Being the same thing is the best way to do that.
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