Hubble Space Telescope Image of 3C-273 – Credit: ESA/Hubble/NASA I often get asked about how far the telescope in Raheny can actually see.  The answer is in theory infinity, but practiaclly there are limits.  In 2012 I made an observation of one of the most distant and exotic objects in the universe.  Measuring the distance … Continue reading Quasar 3C-273 – Measuring the Redshift