Tag Archives: galaxies

What Does the Expansion of the Universe Look Like from an Galaxy on the Edge of the Known Universe?

Question: If you were to project yourself instantly to the edge of the known universe, (knowing that the universe is expanding at or near the speed of light from this perspective) and you were to take a telescope and look … Continue reading

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Can Atoms Travel Between Planets or Galaxies?

Question: To start, I know very little about what I am going to ask, so much of my question might seem foolish, but… Can atoms travel from planet to planet or galaxy to galaxy. I know light can travel from … Continue reading

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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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