Are we presently beyond an edge? Sept 19, 2019 16:15:16 GMT -5
Post by Radrook Admin on Sept 19, 2019 16:15:16 GMT -5
Are we presently beyond an edge?
That really depends on perspective. If we are located far enough away, then our part of the universe would be deemed to exist beyond an edge where all light blinks out because it hasn't had time to reach us yet. To us the observer seems to have disappeared beyond an edge as well, because his light hasn't had time to reach us either. So the edge, as the following video refers to it, is simply the region that separates the visible from the invisible universe, or a radius of approx 45.7 billion light years from a viewers viewpoint.
Such a viewer perceives regions closer than that edge detectable as they were in the distant past. The nearer they are to him, the nearer that past becomes. For example, we see the Andromeda galaxy as it was two million years ago, Alpha Centauri as it was four years ago and our sun as it was eight minutes ago.
According to calculations, the current co-moving distance—proper distance, which takes into account that the universe has expanded since the light was emitted—to particles from which the cosmic microwave background radiation (CMBR) was emitted, which represents the radius of the visible universe, is about 14.0 billion parsecs (about 45.7 billion light-years), while the co-moving distance to the edge of the observable universe is about 14.3 billion parsecs (about 46.6 billion light-years), about 2% larger. The radius of the observable universe is therefore estimated to be about 46.5 billion light-years and its diameter about 28.5 gigaparsecs (93 billion light-years, 8.8×1023 kilometers or 5.5×1023 miles).
So yes, we ourselves are beyond that mysterious edge for those who might be unable to detect our light because it hasn't reached them yet and for others whom it never will.