Future Visibility Limit
1. The future visibility
limit is 62 billion light-years. This does NOT mean that objects at this
distance emit photons toward us now, and that those photons will reach
us sometime in the future.
2. Any object farther than 16.5
billion light-years emits photons toward us now, but those photons will
never reach us, even if we wait for an infinite amount of time.
3. So
what is 62 billion light-years? Well, it is the radius of a sphere from
HERE NOW. Those objects within this sphere, whose photons we have not
yet received, emitted light in the past when they were within 16.5
billion light-years of us. These photons are still on their way, and
when they reach us in the future, we will be able to see those objects.
4.
We will only be able to see objects in the future that are currently
within the 62 billion light-years radius, and whose photons have already
entered the 16.5 billion light-years radius.
5. We will
never receive photons from these objects that haven't yet entered the
16.5 billion light-years radius. As a result, we will not be able to
observe the view of these objects that those photons could have shown
us.
6. Any galaxies currently forming within the 62
billion light-years radius and emitting their first photons now will
never be visible to us if their distance is greater than 16.5 billion
light-years.
7. We will not see these objects as they are
now, nor as they will be in the future. We will see them as they were
when they emitted the photons.
8. There are no objects
beyond 62 billion light-years whose emitted light is within the 16.5
billion light-years sphere. Any object farther than 62 billion
light-years has never had its light reach us, not even in the past.
These objects have never been visible to us, even at any point before
Earth existed.
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