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skye at night

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Everything posted by skye at night

  1. The Earth is still (even after 4.5 bn years) releasing energy dating back to its accretion from dust, debris and gas as gravitational energy and also from the decay of radioactive elements. The core is probably solid (Fe) due to the density and despite the enormous (4500-5000 deg ) temperature... The Iron/nickel? core combined with the overal mass of the planet and its rotation are 'probably' responsible for gravity... The Moon influences our gravity to some extent and affects tides for example... Volcanoes are not directly linked to the core, but are a result of the heat transfer through from core through mantle to crust via convection cells (massive ones) and crust flaws like 'hot spots' (thinner active point on ocean floors mainly) plate boundaries and rifts (MOR and Great African Rift Valley for example). Iceland sits on the Atlantic Mid-Ocean -Ridge so is basically an Island splitting apart and growing through volcanic activity... If you ever want to see a 'really' active volcano... go to Stromboli Island in Italy and get a local fishing boat or other to take you out there... Erupts every 5 minutes... Steve
  2. I think it is starMap, the 'pro' version is around 10 pounds... expensive as the apps go... Steve
  3. Was actually referring to previous picture for the 27th. Steve
  4. eastenders.... media fodder for the masses wean her off it... she will appreciate it in the end. Steve
  5. Not sure it will work as it has a flat barrel shape unlike the usual cigar /sx type guidecams and may 'interfere' with the body of the OAG unit. Steve
  6. very strange.... Astronomy Picture of the Day
  7. Hello, The Alaskan data is fed from many sources I believe... i have found their data to be much more accurate than others especially aurorawatch who often fail to predict peaks in activity AND are known for more than the occasional false alarm also... Steve
  8. No dust evident up here in NW Highlands!!! I'm not usually part of the 'tinfoil hat brigade' but the cynic in me is screaming that there is more to this than volcanic dust... Volcanoes erupt constantly throughout the world and seem to rarely (only 2 records can be sited on news) have any impact on air traffic... I am well aware of the type of volcanism at work and the effects as I am a Geologist by profession so also well aware of the different types of volcanism throughout the world and their associated ejecta.... (have visited Iceland and Mt St Helens Washington) However.. While not understanding the jet engine mechanics side of it fully... I do not believe that THIS particular eruption would be taken by so many governments as the sole reason for grounding so many flights... I suspect something else making convenient use of this eruption to keep flights grounded.... Katla is often associated with eruptions of Eyjafjallajökull... Is Katla about to blow its sides off? I suppose Iceland would be having some form of evacuation if it was thought so... Why despite the grounded flights (I see the Iceland bound flights every day from here) have I seen a couple of high altitude planes in the last 2 days? Easily visible in the clear sky we briefly had... Surely even if military (and why would they be?) the same rules regarding engines and safety would apply? I am not suggesting anything 'ET/close encounters' but more some other important reason beyond just a volcanic eruption that maybe the 'powers that be' feel we are not fit to know about... I will keep my personal thought on this to myself for the moment though... Now where's my tinfoil? Must run.. i can hear a helicopter outside.... Steve
  9. aurora watch is garbage.... I can assure you.... try gedds alaska Steve
  10. YES.... Very much so.... In fact your camera will pick up all stray light to a higher apparent degree than your eyes because it will 'accumulate' the influence of the LP in exposures and increasingly so with longer ones... LP is often the main (assuming good tracking/guiding) limiting factor in exposure length... Even stray light from a different direction will affect images. Filters can be used to varying degrees of success to overcome the effects. Processing can also be efficiently used to remove it also... In an ideal world a clear truly dark sky would be King, but at least there are ways to overcome the ever increasing problem of LP. steve
  11. sorry bumped the key board and posted gibberish (as normal) before finished Steve
  12. its not one I recognise... seems to be similar mag. to mercury... so could just be a low mag star that you have picked up a bit higher above the murk than mercury or venus. Steve
  13. What size of filters did you use? Was first image cropped any? Can we see a full frame image... Nice though. Thanks Steve
  14. Perhaps the cost IS an issue as the silver would have to be near pure to avoid easily oxidised elements like copper etc in the 'mix'. Yes, Sterling is cheap, even fine/britannia silver, but then 9K gold is a way different species from pure gold... Maybe just a matter of 'what works' as the alu coatings these days are usually quartz (or similar) overcoated... Not sure about reflectivity of silver, but I do know it is a better electrical conductor than copper, but we do not have our houses wired with twin and earth silver core cable... I'd quite like to know the answer myself. Steve
  15. I have wondered if a laminated (thin layers of glass or ceramic) mirror would work... maybe a final figuring by traditional means or ion/laser... Steve
  16. On a similar BBC related note regarding the 'vague and vacant'... I watched a show recently that had a 'paediatrician' as a contestant... The BBC had 'dumbed down' his occupation to 'Children's Doctor'... What hope is there? BBC News | WALES | Paediatrician attacks 'ignorant' vandals Steve
  17. Only to be expected when a large percentage of this vapid nation spends their first waking moments consulting their 'stars' ..... And they still get allowed a vote in the election! Steve
  18. If you use losmandy type, (which I can recommend for any scope that needs secure mounting) there will be plenty spare holes through which you can drop a pin or sockethead bolt... I have used a loop of heavy duty single core electrical wire with a twist to secure also. Steve
  19. ahhh.. dirty electricity..... steve
  20. CANON EOS EOS EOS 1000D Digital SLR Camera Body - 10.1 mp at low prices | Dixons use voucher easter 15 to get another 15 off. steve
  21. Welcome here. Was in Stirling last week briefly, skies not as poor as I expected, Pitlochry also which I expected to be at the mercy of Perth LP. Everyone started with a Tasco or similar... it's compulsory.. Steve
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