Aha, very cool! Was wondering how we could "see" something 20 billion light years away when it seems to me that the so-called Cosmic Dark Age* would prevent any light that far out from reaching us. So this must be the answer... right?... right?... I don't know. Just trying to grok.
*In Big Bang cosmology, shortly after the blazingly bright Big Bang itself, there came a time when the universe was utterly dark. This period, before the first stars were born, and is thought to have lasted several hundred million years in our 13.8-billion-year-old universe. Astronomers call it the Cosmic Dark Ages... Source
If these "Einstein Crosses” are what these orthodox cosmologists claim they are, then it is amazing that we are so conveniently sitting right at the exact focal length for them to make such well focused images on 90° axes. I think that if they were such lenses there would be hundreds more which produce fuzzy, out-of-focus "Einstein Crosses" or even "Einstein Rings" where the light fails to come into focus. We don’t see that. . . Nor do we see light bent around in a single image matching another we see in the other side. We should.
The universe is about 13.8 billion years old, so any light we see has to have been travelling for 13.8 billion years or less – we call this the ‘observable universe’.
However, the distance to the edge of the observable universe is about 46 billion light years because the universe is expanding all of the time.
Imagine that a photon of light is emitted from a point on the edge of our observable universe.
While that photon has been travelling through space, the universe has expanded. We have moved away from the point where the light was emitted, and it has moved away from us!
Though the light might have only travelled for 13.8 billion years, the distance from us to the point it came from is, at present, 46 billion light years!
So how big is our universe? Well we don’t really know, but it’s big. So big that even light hasn’t had time to cross it in nearly 14 billion years! And it’s still getting bigger all of the time.
Read more at: https://phys.org/news/2015-10-big-universe.html#jCp
Sun dogs
Of all the lines perpendicular to an ellipse, only four of them intersect the center point of the ellipse.
Ping.
I don’t get it. Shouldn’t there be 6 points of light, like in the Star of David? Einstein was Jewish. Why would he invent something in the shape of a cross?