Putting both Dark Matter and also Dark Energy aside, if you look at everything we can see, all the galaxies, then it has been rather clear that a lot was missing, or to be a tad more precise, had not actually been observed. How was that known? Well, basically what should be there had been … Read more Half The Universe has just been found
Regarding the question in the title, “How do we know how many Galaxies exist in the Universe?”, the short quick answer is that we do not have a precise number, instead what we have is an estimate that is based upon observational data collected by Hubble. There have been recent stories within the media regarding … Read more How do we know how many galaxies exist in the universe?