How would our perception of the universe change if instead of observing red shift, we observed blue shift?
Good question! IMHO: It would alter cosmology as we know it today: 1) Galaxies and other deep would be moving towards us. 2) This would also indicate that the universe was shrinking. 3) it would also indicate that there was enough mass in the universe to halt the outward expansion of the universe and reverse it. 4) Instead of the “Big Rip” the “Big Crunch” would be on. Currently we postulate that the big bang occurred once and that all things (as we know it) will end in the “big rip”. So with some confidence we can calculate age of the universe to be about 13.4B years. With a predominant blue shift The theory that the universe is recycled by collapsing in on itself and then re-expanding (like a cosmic Yo-Yo) would be the accepted theory and we really would no be able to know the age of the universe nor the age of the current “instance” with any amount of certainty.
