Explain thew laws of physics

It is thought that the laws of physics do not change from place to place. This is why experiments carried out in different countries by dissimilar scientists - of any religion or race - have always led to the same results if the experiments have been done honestly and correctly. We also think that the laws of physics today are the same as they were in the past. Evidence, contained in the light that left distant stars billions of years ago, strongly shows that the laws operating at that time were no dissimilar than those today. The spectra of different elements then and now are impossible to tell apart, even though physicists have looked very carefully.