Questions Show – Black Hole Surfaces, Magnetic Field Strengths, and the Speed of Gravitons

Posted on Sep 18, 2008 in Questions Shows, Your Questions | 6 comments


As you know, we wanted to answer listener questions regularly, but we found it was taking away from the regular weekly episodes of Astronomy Cast. So we’ve decided to just split it up and run the question shows separately from the regular Astronomy Cast episodes. If this works out, you might be able to enjoy twice the number of Astronomy Cast episodes. So if you’ve got a question on a topic we cover in a recent show, or you just have a general astronomy question, send it in to info@astronomycast.com. Either by email, or record your question and email in the audio file.

  • Questions Show – Black Hole Surfaces, Magnetic Field Strengths, and the Speed of Gravitons
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  • Shownotes

    Does a black hole have a definite surface?

    How does the size of a magnetic field come into play for astronomical object vs. bar magnets

    Could dark energy be the uncurving of space?

    Do gravitons travel at twice the speed of light?

    Is the amount of gravity that comes from an object come from every molecule in the object?

    Is there a balance between the pull of gravity and the repulsion of magnetism?

    6 Comments

    1. In the above-linked Discussion of the bowling-ball-rubber-sheet model, the author concludes that Einstein was wrong and that Newtonian physics still prevails. I doubt that this is what you meant to tell us.
      He is taking the analogy too literally, as if the fabric of space-time was a physical medium being curved by gravity. There are other logical fallacies as well, but I haven’t the space here to address them.

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    2. After watch I think a Nova show and heard that dark energy is 73%, dark matter 23% and 4%the rest known matter…why am I the only one to notice that the Sun is 73% Hydrogen 23% helium 4% metals….happy oddity?
      Also would all orbit energy of all orbiting mass add up in some math way to the 220,000 m/s the sun orbits the milky way thus showing a way to know when all orbiting mass is known or % known….so it dont collide with earth…

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    3. Empyre-
      That was obviously the wrong link! I’ve put in a better one and added a link to the Gravity Probe B site that has an interactive bowling-ball-rubber-sheet model.
      Thanks,
      Nancy

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    4. I’d love to see this and similar topics discussed more at The Black Hole general-interest discussion forum; people get a bit confused by our name sometimes, but we’re focused on much more than just space/astronomy interests. In fact, we’re wide open….and as a result, I think people don’t end up tackling these topics nearly often enough!
      I considered making space & all things cosmic more of a specific focus for TBH, but the membership has been very passionate about keeping things wide-open to all topics….and with good reason. When covering breaking events like the recent Mumbai Terror Attacks, we have been able to do things that nobody whose focused was restricted would be able to duplicate.
      So, if you’re interested in black holes, or anything else relating to the larger cosmos out there….please consider joining us at TBH! We could use more people like yourselves, and will most definitely be adding some links for this great site to our Internet section 🙂
      Keep up the good work, AstronomyCast — from everything at The Black Hole and Xerces Media/Xerces Partners International 🙂

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    5. If you want to be even more blown away by black hole surfaces, listen to one of the Silicon Valley Astronomy Lecture Podcasts: “Black Hole Wars: My Battle with Stephen Hawking”. 11/7/08. Really scary, really cool. Silicon Valley is listed in iTunes Store, same section as Astronomy Cast.

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