Quote:
Originally Posted by Vanamonde
Mmm, okay, so for example...
Say, 10 billion years ago, a supergiant star went supernova in the halo of a young galaxy and sends photons that the Hubble Space Telescope focuses and images today.
But in 10 billion years, the universe has expanded so that star is actually, I don't know, about 50 billion light years away now. In the beginning, the star and photon are leaving each other at C but as the distance increases the space between them expands. and THAT makes them separate at a distance greater than C. But the image we see is a 10 billion year old image and we have no idea what that star is like in our time, today, at a distance of 50 billion light years.
We know that C is the limit in our accelerators, we push particles to that limit everyday and they will not go faster, just get heavier.
The photons are limited to C but spacetime is not. Spacetime is the medium that photon travels through.
Does that make sense?
And for my sake, please do not increase gravity. I have an hard enough time as it is! Now, if you could lessen gravity without losing the oxygen, I could support that!
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its more that that:
take what you said and re-write it a little:
"Say, 10 billion years ago, a supergiant star went supernova in the halo of a young galaxy and sends photons TOWARD that the Hubble Space Telescope WHICH ARE STILL BILLIONS OF LIGHT YEARS AWAY AND TRAVELING TOWARD US AT A SLOWER RATE THAN THE EXPANSION OF THE UNIVERSE so no focusing and no images today, tomorrow or ever."
"But in 10 billion years, the universe has expanded so that star is actually, I don't know, about 50 billion light years away now (or more like 500 billion light years) and not one photon as been able to rech us - not 10 billion years ago nor today nor tomorrow."