If light-years dictate time in a sense of looking X years in the past, why is the Big Bang theory standard if we are essentially trying to discover space at the same time as our own ocean, which we know little? Does an overlap of capability not appear apparent, and if not why?

Question

If light-years dictate time in a sense of looking X years in the past, why is the Big Bang theory standard if we are essentially trying to discover space at the same time as our own ocean, which we know little? Does an overlap of capability not appear apparent, and if not why?

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Answer 1

I always understood light-year as a measure of distance. Since saying 9.46 Trillion Kilometers Doesn’t exactly roll off the tongue.