Recently I read an article showing how some astronomers discovered some of the oldest Galaxies they have found yet and they are an order of magnitude dimmer than any found so far. They did this using gravitational lensing and a bunch of fancy algorithms to occlude light from much brighter galaxies in the foreground.


This got me thinking. Since the universe is expanding, if you could occlude all of the light from the galaxies in the foreground, wouldn’t the relative perceived size of the galaxies start dramatically increasing? After all the light from these galaxies would have been emitted back when the Universe was a much smaller place and the distance between those galaxies and us would have been much closer at that time.