Category Archives: Galaxies

How Can Gas Particles Stick Together to Ultimately Form Stars and Planets?

Question: There is a lot of acceptance that when the gases of the universe began to join and spin because of the impact of those collisions. That would mean that all particles hit in the same direction, like using your … Continue reading

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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 Radio Astronomy Can Be Done at S-Band?

Question: At work, we have a 14 foot dish with an S-Band receiver.  Are there any interesting radio astronomy frequencies around S-Band?  – Frank Answer: The radio astronomy S-band runs from about 2655 to 3352.5 MHz.  Its use in radio … 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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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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What is the Size of the Giant Galaxy IC1101?

Question: I’ve been looking at information about the largest known galaxy, IC 1101. Most sources say it is ~6 million light years in diameter but I can’t find any primary sources for this size estimate. I was looking through research … 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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Why Do Stars Form Preferentially in Spiral Arms?

Question:  Why most of the star forming regions/open clusters are in the periphery of galaxies(in spiral arms)?  – Vinod Answer:  Star forming regions are concentrated in parts of galaxies that contain high concentrations of the material from which stars are … Continue reading

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What is the Universe Expanding Into?

Question:  Thank you for helping so many people. Is there an educated guess by professionals about the difference between what the universe is expanding into and the universe itself?  – Jay Answer:  This is going to sound very paradoxical, but … Continue reading

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