Tag 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 Many Hours Are There in a Galactic Year?

Question: How many hours does the earth orbit the milky way in 3 years  — Xondra Answer: I suspect that you are asking about the length of a “galactic year”, or the time that it takes the Earth to orbit … 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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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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