physical constants stay constant. If the speed of light was constantly changing and we didn’t know about it, it would send our world and our scientific calculations into chaos. There are other constants that are just as necessary. We keep measuring them to make sure that they are not changing but let’s fact it – a couple hundred years may not be enough time to notice a change in the 13.7 billion year old universe. So some Dutch scientists at the University of Amsterdam looked through the Effelsberg 100m Radio Telescope at a distant galaxy that is 7 billion light years away looking for proof that the fundamental constants of the universe were not changing. They compared the specific light features associated with a simple alcohol called methanol to those associated with methanol here on Earth. Their measurements confirmed that the methanol 7 billion light years away was nearly identical to the methanol here on Earth.