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  1. I loved these books, but now I realise the protective effects of an atmostphere, how come they didnt all get freied by radiation, when they ran about outside?
  2. Smaller planets lose heat faster than bigger planets ( surface area), so Mars lost its heat faster than the Earth, and now its core is solid. You need a magnetic field to keep lighter gases like o2, you can either get that with fast rotation and a liquid iron core like the Earth ( venus rotatses v slowly, so this only gives a small field)., or with something called induced magnetosphere as, Wikiepedia informs us Unlike Earth, Venus lacks a magnetic field. Its ionosphere separates the atmosphere from outer space and the solar wind. This ionised layer excludes the solar magnetic field, giving Venus a distinct magnetic environment. This is considered Venus's induced magnetosphere. Lighter gases, including water vapour, are continuously blown away by the solar wind through the induced magnetotail.[3] It is speculated that the atmosphere of Venus up to around 4 billion years ago was more like that of the Earth with liquid water on the surface. A runaway greenhouse effect may have been caused by the evaporation of the surface water and subsequent rise of the levels of other greenhouse gases.[7][8]
  3. Welcome aboard, have fun here, its great, I have had loads of help from very friendly folks!
  4. Welcome aboard, have fun here, its great!
  5. Welcome aboard, have fun here, its great!
  6. wiseman


    Welcome aboard, have fun here, its great!
  7. Welcome aboard, have fun here, its great!
  8. So, the filter sits over the small hole on the plastic cover, and this cover goes where? in its origional place on the non flex bit of the tube tube, or over theh top, near the secondary mirror?
  9. Thanks guys, err yes I hadnt thought of the filter blowing off, err, will have to think of a foolproof way of fixing it. I do have a shroud, will have to make sure its absolutely light proof, and I dont have a finder as I use a Rigel finder, so thats one less thing to worry about. Thanks Wise
  10. Welcome, there is loads of helpful advice here, ask away!
  11. I'd love a solar scope , but that not going to happen before a lottery win, so.... Is it possible and or practical, to get a filter for the scope and eyepiece and get to see interesting stuff on our nearby star? I am guessing I need some filterfilm or cover for the opne end of the scope, then some filter that screws into the e/p? What do we think? Cheers Wise
  12. Hi Rainlaw, I started with a goto 8 inch dob, and the goto was b7ggered, so I had to do it all by hand to start with. Here are my complete beginners recomendations... 1. Buy the book turn left at orion , from amazon. Its perfect for beginners, and leads you through what to look for at what time of the year 2. use an iphone or an ipad with star walk application, its just fantastic for finding stuff, easily. ( if you dont have one of these, get a planishere to help you get a starting point, or borrow someones IPad over night, after all they wont be using it while they are in bed) 3. Buy a laser colimator for getting the mirror correctly sorted, its so much easier than the colimating eyepiece 3a buy a set of knobs from bobs knobs, this also makes colimating much easier 4. Make sure that the finder is properly aligned ( do this at dusk, when you can aim at a chimney to get the alignment sorted out, also buy some spare batteries so you have a spare when you leave the finder switched on when you pack up the scope for the night) 5. get to understand that what you see through the scope is upside down and back to front. So when you look up at the sky and see a star in the finder and want to move to the star to the right of it, it will look in the scope that the star you want is to the left of it, but you will still need to move the scope to the right to get to it For what its worth, I have had my scope for a year now and I already want a bigger aperture scope, so dont for gawds sake buy a smaller one!!. If you have pots of money, buy a 10 inch goto dob and sell your current scope, if not the buying the bits to make yours into a goto, mentioned above may help. I bought a wicksey and never used it, I also never used the circular disk mentioned above, but then i did have my wifes iphone to find stuff . I have been staggered by what I have seen, fer instance, I didnt know that Polaris was a double star, and thats a piece of cake to find, find the plough, follow the two stars on the pan and the next bright star you see is Polaris to the North. Get it in the low power eyepiece, then swap for more powerfull eyepiece, then BOOM!, two stars pop out, and turn left at orion explains what type of stars they are, how far they are from each other etc etc etc, which is great stuff Trust this helps Cheers Wise
  13. Thanks John, I was looking at DSO's with the 8mm, when I said fuzzy I will do a comparison with the zoom versus fixed8 mm EP on the moon and see what the comparison is Thanks
  14. sorry, yes it is the SPC900, funnily enough I do have a VN1500 motorbike, so maybe I was getting mixed up ( must rememebr not to use that to look at the stars with)!. Ok, so next steps, focus on a bright star ( vega/Artcurus, etc, or moon if its on show) fiddle with gain and contast until you can see something. Then focus Then see what you can capture. OK, will do thanks Never underestimate the power of a parfocal ring! Oh dear, there has just been a large increase in the number of things I know nothing about!
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