Space is one amongst the few fundamental quantities in physics, it can’t be defined via other quantities because nothing more fundamental is thought at this. the shape of space isn’t known, but space is thought to be expanding very rapidly thanks to the cosmic inflation. Here is that the list of most amazing space discoveries round the world.
Quasars are found over a awfully broad range of distances (corresponding to redshifts starting from z < 0.1 for the closest quasars to z > 7 for the foremost distant known quasars), and quasar discovery surveys have demonstrated that quasar activity was more common within the distant past. the height epoch of quasar activity within the Universe corresponds to redshifts around 2, or approximately 10 billion years ago.