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Everything posted by nameunknown

  1. Golden section .. yeah right: 0, 1, 1, 2, 3, 5 , 8, 13.... (pretty boring) start instead with 1 and 3: 1, 3, 4, 7, 11, 18, 29..... Then, if your are bored, subtract 1 from each... N= 0, 2, 3, 6, 10, 17, 28..... (lets call those N(x))... divide by N OK, if N(x)/N is a whole number then N is prime (forget one) That is spooky! P
  2. Between cloulds, so far not that bad at all .. but needs a better night
  3. Cheapo rack and pinion is not that bad - I packed it out with a bit of foam and it is fine. P
  4. Well, getting the 200k to sit on the eq5 mount was a bit (lot) harder than I thought. Newton-Ellis were great at making an adaptor, but the things you tighten to fit it all together tend to collide (can't give them a name for fear of the "swear filter"), and balancing is a bit of a nightmare. I'm really quite (very) "unhappy" with the supplier, but it's cooling down now and we shall see soon.... P
  5. Just built one rainy today. Used a cheap (£10 - end of range) "Tesco" scope (500mm) for the rack and pinion, dew shield and spotter - sawed the tube down to to about 10cm and replaced the objective with a lens from a set of (50p) 10x50 binos from a charity shop (they had been dropped on the floor, were "way out of line" and were about to be junked) - knackered bino's are really good, you get some prisms to play with as well as the EP lenses and a spare objective for free. All the tube needed was a bit of work with the Dremel and the objective cell from the bino's went straight in. Just clean the lot with IPA before final assembly. The 5mW laser used for rough pointing was peanuts on DX. The whole thing weighs next to nothing and with a webcam on it should make a half-decent guider. I'm going to add a RasPi to this, once I get my Pi Autoguider LINUX software finished. P
  6. Hi Guys, Thanks for the comments. Not sure we can say that LCDM acts just as ordinary matter under gravity. It certainly partakes of a gravitational interaction, we can see that by its effect on galactic rotation, but whether the Higgs mechanism gives it mass in quite the same way and to the same extent is possibly open to doubt (i.e. no reason to assume it is the same). Also, if DM falls into a black hole one has to resolve the "information paradox" Quantum Physics says information "cannot be lost", while Relativity says that BH's have "no hair" and any information chucked-in is lost (the ultimate "Del *.*"). So either the iinformation that the BH was formed (perhaps in part) from DM is lost or it isn't - there is no clear resolution of that one. Some theories say that the information can be regained from the Hawking Radiation (which isn't normally considered to be possibly DM).... P
  7. I did realise the "cooling" problem - which was the root of my comment about "they may be a little different" - i.e. the accretion process could not be the same. Of course, the hole itself (forgetting for a moment the disk, jets etc) should be the same taking the classiic, mass, spin and perhaps some "charge" model (if DM can have "charge" as EM seems out - but I doubt any "normal" BH has appreciable charge anyway). It was just a thought as to why galactic core BH's could have gotten so big (i.e so different) so early on - otherwise they don't seem to have enough time to form I did find this just now: http://www.scientificamerican.com/article/dark-matter-black-holes-destroying-pulsars/ and this... http://arxiv.org/pdf/1502.05043v1.pdf
  8. Ok, here's an odd thought, we have some issues with "large black holes" in the early Universe. What if they form of "Dark Matter". Can this happen? They might be a little different to normal black holes...
  9. mmmm... it's said of Switzerland that if there is one thing they can hide better than their money it is their sense of humour, so amateur astronomers having a rant about results at CERN might not go down too well. Pity really, in places they have quite good clear skies, although the mountains do get in the way.
  10. Yes, now I can. A nasty back complaint and early retirement on health grounds. Hve to get my blog going!
  11. "Magnificent desolation" captured in acrylic. One wonders how few have spent such time over her inconstant face in that particular medium.
  12. Vega? - it was probably the aliens from "Contact". If you manged to download the instructions in the off-carrier polarisation modulation, it's a Maplin parts list for a machine which will whisk you away to meet Carl Sagan, Jodie Foster, or a Bill Clinton look-alike. If the parts are in stock that is. On the other hand, up to a few weeks ago you couldn't look anywhere without seeing Tim Peake...
  13. Special Robes? - I didn't get those - safety shoes in case you drop it on your foot, yes, a large hammer for collimation (Think "Armagedon "Russian Engineering"), yes, an anti-rupture truss to wear while lifting it onto the mount, yes, a guarantee that your telescope will most likely win against a Tiger IV tank, yes, but special robes , no - am I missing out? I do note that since I set it up my telescope has reverted to a Russian Orthodox calender, but seriously.... ...special robes ..
  14. Yikes, the universe needs a refit? I knew it was too good to last.
  15. The "Nutralino" perhaps - or it could just be a bit of spin - a possible candidate to form "cold dark matter". Awesome to think that these whisps of twisting nothing might be most of everything, while the rest of our universe is just a little noise in the background. P
  16. Well, with a bad back my SO ("telescope assistant") has to "give me hand" with some things, and shifting the "lid" is one of them. P
  17. So equiped with the ironing seat can we go from https://en.wikipedia.org/wiki/Extreme_ironing to extreme astronomy - i.e. daftest place to put a scope next to an ironing seat? Somehow, I think evolution (so far) did not design humans for looking through telescopes
  18. of course, I wasn't being serious about "the surprise"... loss of anyone is a tragedy

    1. Gina


      No problem :)

  19. Black Holes have "recently" got a bit more complicated than the old "event horizon" and "singularity" model. In the old version you could drift beyond the point of no return and notice nothing odd, but the new models suggest that it is not quite so simple and the "event horizon" is a place where you might get fried. It is worth reading up on.
  20. I had a 200p and back pain, I found two answers: put a cam on the scope and sit in a nice warm room to watch remotely, get something like a MAK so you can look through the back Of course there are other solutions I tried: standing on an old beer crate, painkillers, etc.. P
  21. If you like looking at "odd" stars you might want to have a peek at HD 140283 - in Libra (https://en.wikipedia.org/wiki/HD_140283) - it is known as the "Methuselah" star because it is believed to be almost as old as the universe (it is about mag 7.2). It got a pensioner's bus-pass before Yoda was even born, and is probably the closest Population II star to earth. Given that it is very poor in "metals" (other than a bit of lithium), it possibly doesn't have much in the way of potentially habitable planets, let alone planets with very, very old ruins on them that could feature in some "Star Trek" episode (complete with "Greek" architecture so you know the ruins are old). P
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