Category Archives: Galaxies

Where Can I Find Fluxes for Strong Radio Galaxies?

Question: I am trying to calibrate New Horizons radiometry data and need flux of strong radio sources (Cas A, Cyg A, Tau A, and Vir A) at 7182 MHz.  Is there a good catalog of this basic information (flux at … Continue reading

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When will the Andromeda Galaxy Collide with the Milky Way Galaxy?

Question: Do you have an accurate estimate on when Andromeda will be colliding with our Milky Way galaxy?  — Charlie Answer: About 4 billion years.  There is a nice simulation of this collision that you should check-out.  Gives one a … Continue reading

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What if the Big Bang Started as a Gigantic Supernova and Associated Black Hole?

Question: A cosmological “what if ” Here’s my question: suppose for the sake of argument, the big bang happened somewhat differently, that it was like a huge mega supernova, and created super-duper massive black hole. A universal black hole. THE … Continue reading

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Availability of VLA Measurements of M87?

Question: I am contacting you on behalf of the MAGIC collaboration. I was wondering whether you took with VLA any further data on M87. We are trying to get an MWL coverage for our observation period spanning from 2012 to … Continue reading

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How Many Earths Can Fit in the Volume of the Milky Way?

Question: How many earths can fit in one galaxy and if the earth were about the size of galaxy how many planets, moons, etc. would be able to fit on earth.  — Xondra Answer: To answer this question you need … Continue reading

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How Long Does it Take the Sun to Orbit the Center of our Galaxy?

Question: How long does it take our sun to complete a full orbit around the super blackhole at the center of the Milky Way?  — Dustin Answer: We can calculate this value by noting that the Sun is about 8 … Continue reading

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The Eventual Collision of the Andromeda and Milky Way Galaxies

Question: If I understand the various articles I’ve read and programs I’ve seen on TV and the internet.  It has been determined that the Andromeda and Milky Way galaxies are on a collision course and are destined to “collide” in … Continue reading

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How Do Galaxies Stay Intact?

Question: Do black holes spin? What makes galaxies stay semi organised while precessing around it? I don’t know how else to word that. Physics is hard.  —  Nathan Answer: Yes, it is believed that black holes do spin.  The stars … Continue reading

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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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