Category Archives: Cosmology

Inconsistency Between the Age and Diameter of the Universe?

Question: I have read that the diameter of the universe is 96 billion light years.  How can that be if the universe is a mere 14 billion years old?  Am I to conclude that the 96 billion figure is some … Continue reading

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What is the Large Scale Structure of the Universe?

Question: What does the structure of the universe look like at the largest scales? Galaxy cluster are distributed evenly throughout space with no large gaps There are many more galaxies and clusters in some directions (up and down the milky … Continue reading

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Did the Big Bang Happen in a Pre-Existing Universe?

Question: Is it possible that the big bang occurred in a pre-existing universe? if not, how do we know?  – Gary Answer: I think that the best evidence to support the fact that the Big Bang happened in this universe … Continue reading

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Could the Accelerating Expansion of the Universe be due to a Pulling Force?

Question: Isn’t it possible that the answer to the increasing speed of the expansion of the Universe is that it is being pulled apart not being pushed apart? If the “unknown” Universe was trillions of light years of dark energy … Continue reading

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How Can a Supermassive Black Hole Form in a Galaxy Only 900 Million Years After the Big Bang?

Question: It is a challenging research topics to search how supermassive black holes formed at the early epoch. I am very much interested to do my future research on this topic. Could how please tell me what can be possible … Continue reading

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Why are Andromeda and the Milky Way on a Collision Course Rather than Moving Away from Each Other?

Question: If the universe is expanding and all galaxies are moving away from each other, how is it possible that the Andromeda and milky way galaxies are on a collision course?  – Johnny Answer: It is correct that on the … Continue reading

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Are There Multiple Universes?

Question: Hi! I am from Salt Lake City Utah. I’m in the sixth grade and in middle school. Middle school is really amazing and I love it. But what I love about it the most is my science teacher. His … Continue reading

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Light Travel Time from Exploding Stars

Question:  I am not able to understand one thing, when we say we saw a star exploded billions of light years away, does it mean it exploded billions of light years ago but the light reached to you just now. … Continue reading

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The Kerfuffle Over Non-Cosmological Quasar Redshifts

Question:  Some years ago I read an article that said (if I recall correctly) that there were quasars that seemed to be associated with galaxies (maybe in the center), but the quasar’s much larger red shifts implied that their distance … Continue reading

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How Do Astronomers Study How Things Evolve?

Question:  We know that stars and galaxies we see are just fossil light as they were millions or billions of years ago. Is it possible to extrapolate the changes that we see today in those galaxies to determine their current … Continue reading

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