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Questions and Answers
What is the estimated diameter of the observable universe?
About 90 billion light years.
How many galaxies are estimated to exist in the observable universe?
At least 100 billion galaxies.
Why is it unlikely that we will ever know about alien civilizations in other galaxies?
Because everything outside of our direct galactic neighborhood is pretty much out of our reach forever due to the expansion of the universe, even with really fast spaceships.
Why is it difficult to reach places outside of our direct galactic neighborhood even with fast spaceships?
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Which area of the universe is suggested to be a focus for the search for potential alien life?
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Why is it challenging to reach places outside of our direct galactic neighborhood, even with fast spaceships?
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What is the estimated number of galaxies in the observable universe?
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Why does the text mention that even if there are alien civilizations in other galaxies, we may never know about them?
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Why does the text mention that there should be lots of opportunity for life to develop and exist in the universe?
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What is the estimated diameter of the observable universe?
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