Astronomers would want to devote so much precious telescope time to observing totally ordinary regions of the sky in such great detail because statistics tells something about objects that are not in the statistical sample.
First, let's know, why astronomers need telescope to make observations,
The purpose behind this is gathering more light so that very faint objects can be observed, and magnifying and make those images clear so that distant objects can be observed through telescope.
As you might know, both space and time were created at the big bang about 14 billion years ago, so there is nothing beyond the universe. However, much of the universe exists beyond the observable universe, which is maybe about 90 billion light years across.
The universe is much bigger than our thoughts, we're just a piece of sand in front of it, that's why we need much better telescopes time by time to make observations, to look through it, Only because it helps us to understand our sky better.
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