If you were to divide the present-day universe into cubes with
sides 10 million light-years long, each cube would contain, on
average, about one galaxy similar in size to the Milky Way.
Now suppose you travel back in time, to an era when the average
distance between galaxies is one quarter of its current value,
corresponding to a cosmological redshift of 𝑧=3. How many
galaxies similar in size to the Milky Way would you expect to find,
on average, in cubes of that same size? In order to simplify
the problem, assume that the total number of galaxies in the
universe of each type has not changed between then and now.
If you were to divide the present-day universe into cubes with sides 10 million light-years long, each cube would contai
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answerhappygod
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If you were to divide the present-day universe into cubes with sides 10 million light-years long, each cube would contai
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