geordief

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geordief last won the day on August 31

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  1. What if the Sun turned into a Black Hole?

    Yes I think I am happy with that now. The curvature remains the same ;so PI remains the same and so the (4d?) volume remains the same. But in the vicinity of the Sun turned Black Hole 4d volumes would have changed alarmingly I guess. Are you still saying (if you were) that the curvature at the place that was the edge of the Sun is the same after the Black Hole has formed? edit: on reflexion I suppose it is ---all the changes of curvature seem to me now to take place within that region.
  2. What if the Sun turned into a Black Hole?

    I am clearly fixated on the notion that mass curves spacetime (a sphere with a radius r will have a different value of pi if it has mass at its centre -different from it would have if it didn't) and I am imagining that this redistribution of mass in the Sun converted magically into a Black Hole should have some comparable effect on the surrounding volumes (pi is related to the volume ,isn't it?) I may have made a leap too far,.(My volume is 3d and these effects -if they apply -are 4d)
  3. What if the Sun turned into a Black Hole?

    I probably need to increase my general knowledge in this area but maybe I can understand that concentrating the density of mass in any one location frees up empty space vacated by the objects in their previous locations.(so that the overall volume is unaffected )
  4. What if the Sun turned into a Black Hole?

    (I feel like a contestant on QI who knows that his answer is going to set off the klaxon, but here goes) What about the volume that has been "sucked out" of the Sun , won't that draw in the rest of the Solar System's volume in so that the "perimetre" of that volume shrinks (imperceptibly) in proportion missing volume ? I expect I am wrong but do you see why I am thinking this?
  5. What if the Sun turned into a Black Hole?

    But would it be ,in theory be possible to take a volume extending out ,say I light year from the Sun ,calculate its volume and then perform the same calculation after the Sun was migicked to its new 3km radius size? It seems impossible to me to calculate the volume in the first place as it is a moving/dynamic quantity (the time at the edge of the volume of the sphere is not the same as the time at its centre (the Sun) But maybe there are ways to do it....are there?
  6. What if the Sun turned into a Black Hole?

    Does "volume of the Solar System" have an actual meaning? If so ,what might it be ?....you seem to be saying it would be unchanged if the Sun was transformed (with a magic wand) to a 3k radius wide body ...
  7. What if the Sun turned into a Black Hole?

    So ,taking the solar system as a whole it would (be almost as if all the space in the Sun except for a 3km radius volume would have simply ceased to exist? Would the volume of the Solar System have also shrunk by the same amount?
  8. No I know it can't normally but what if it did and we could decide on the radius of the new body? If the radius was small enough would it cease to have much effect on the movement of the planets (would they lie outside its region of gravitational influence? ) Is there a limit to how small a radius the "new body" could have? Does its radius depend directly on the mass of the bodies that have been incorporated into it in the first place? Does its radius remain the same provided there are no more additions of massive bodies?
  9. Democrats Get CRUSHED in 2018 Midterms!

    I think "slightly " underplays this when compared with what might have been You are indeed coming from a low base when this result is the near best that could have been hoped for. Like I said ,your post (and one or two others) sent me off to dreamland in expectation of a continuing GOP majority in the House of Representatives in the morning.
  10. Democrats Get CRUSHED in 2018 Midterms!

    To what effect? He has lost the support of the House of Representatives and only marginally increased the GOP margin in the Senate (ie no change). Now he cannot stop scrutiny over his personal and public affairs . Is noone breathing any easier this morning?
  11. Democrats Get CRUSHED in 2018 Midterms!

    You had me down with your pessimism last night. I went to sleep fearing the worst.
  12. Are water vapour levels broadly stable in the atmosphere? Is there any potential for them to rise with increases in global temperatures and impart a feedback effect to any ongoing warming. If so ,what timescales might we be talking about?
  13. Headache

    Thanks.
  14. Headache

    You don't have a reference for that do you? I was convinced my headaches were due to that (and acted accordingly with success **) but was unable to find any confirmatory evidence online ** by avoiding indigestion I cleared myself of those chronic headaches and also noted that, while I still had them they would disappear once a healthy hunger came back.
  15. One of my early life vainglorious achievements was to have been kicked out of Boy Cubs for failing the tidiness test. Needless to say I have gone from strength to strength ever since