But the expansion of the universe is accelerating which tells us we are not in a big crunch scenario. And we have probed the laws of physics over very long distances and far into the past by looking at very distant objects and have to date not found any strong evidence for varying laws of physics over space or time. There are for example some claims of variations in the fine structure constant but as far as I can tell those claimed variations may still be explained by experimental errors and are therefore not widely accepted.