- #1
Gerinski
We can't see the whole universe but only a portion: the visible universe is the region from which light did have time to reach us (our past light cone).
We are familiar with the quote that "there is much more universe out there, but its light did not yet have time to reach us".
As time will pass, can we expect completely new objects to suddenly appear in the sky? I mean, are there objects whose light by now did not yet reach us but (let's say) by year 2500 their light will finally arrive to us so a new object will suddenly show up in our telescopes?
Or is the visible horizon fixed so objects that are out of it will remain forever out of sight?
And putting the question upside down, could the opposite happen?, an object which we can now see, could it due to motion or space expansion get too far so light from it would not reach us anymore? (visible objects suddenly disappearing from sight)
We are familiar with the quote that "there is much more universe out there, but its light did not yet have time to reach us".
As time will pass, can we expect completely new objects to suddenly appear in the sky? I mean, are there objects whose light by now did not yet reach us but (let's say) by year 2500 their light will finally arrive to us so a new object will suddenly show up in our telescopes?
Or is the visible horizon fixed so objects that are out of it will remain forever out of sight?
And putting the question upside down, could the opposite happen?, an object which we can now see, could it due to motion or space expansion get too far so light from it would not reach us anymore? (visible objects suddenly disappearing from sight)
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