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About Waddensky

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    Star Forming

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    The Netherlands
  1. I meant the processes on Earth. We don't know what processes cause the phosphine in our own atmosphere, that's what I found really remarkable.
  2. That was interesting. One of the things that struck me was that we don't even know what biological processes cause the abundance of phosphine in the atmosphere on Earth. We're just fairly sure that it's some kind of biological mechanism at work.
  3. Press briefing live now here.
  4. Well, the amount of phosphine found in the Venerian atmosphere cannot be explained by any known non-biological process. So either there are things going on in the extreme conditions on Venus we don't know of, or there's a biological process involved. I think that's interesting. I've read that the oxidation of phosphor-containing iron can produce phosphine in an acidic environment, but the air pressure is way too high to get it from the surface into the atmosphere.
  5. I agree with Steve, the current close proximity of Sirius is a relatively short event. Here's a graphic showing how proper motion of stars change their distance to us over tens of thousands of years (and not millions!) Before the red giant phase, Sirius B was a bright B type star. 240 million years ago the Sirius system wasn't even born yet. B stars have a very short life span.
  6. The heritage models suggested here are great. They will show you lovely details on the Moon and the rings of Saturn with ease. Another good suggestion, slightly over budget, is the Sky-Watcher Skyliner 150P dobson. Here are some other great scopes for every budget. Remember that all scopes in this price range need to be pointed to the right location manually, and need to be 'nudged' from time to time to keep the object centered. Nothing overly complicated, but something you'll need to get the hang of. A more 'grab and go' approach would be a nice pair of binoculars, for example a 7x50, 8x42 or 10x50. No rings of Saturn with these (although at 10x the planet looks slightly elongated), but many, many other nice things to see.
  7. We can achieve quite some resolution with interferometry. Here's an example of the surface of Betelgeuse. Don't need the JWT for that .
  8. The angular resolution of the James Webb Telescope at a wavelength of 2 micrometers is around 0.1" (source). The angular diameter of Beteulgeuse is about 0.05" (source). So the JWT will not be able to resolve detail on the disk of Betelgeuse.
  9. As said, the 150P really is a great improvement over your current telescope. Much higher resolution and ability to magnify quite a bit higher. Try it on some bright globular clusters (M13, M92), you'll be amazed. Just don't expect field of view filling planets, swirling nebulae and bright spiralling galaxies
  10. There's a small number of nebulae that really benefit from a H-Beta filter (M43, NGC 1499 and IC 405 for example). On most of these UHC also performs well. So yeah, it's kind of specialised and maybe not really worth the investment.
  11. What kind of objects would you like to observe? Planets, deep-sky, double stars, ...? The scopes comes with a 25 mm eyepiece IIRC so something in the 8-10 mm range would probably be a good addition. You can also just start using the 25 mm and find out what you miss or need.
  12. Hey, and welcome! The link to another topic that Mark shared contains some very good information on what to expect when doing visual astronomy. The Explorer 150P is a step up from your current scope, but the planets will still be very small and most deep-sky objects will still be very, very faint grey smudges, sometimes only visible using averted vision. But don't let this put you off: when you gain experience, you will be able to see incredible amount of detail on the planets and see faint deep-sky objects you never dreamt of. The 2.5 mm eyepiece will most likely give you too much magnification for the scope. Best to keep it under 150x, beef it up to 200x on a really good night. Not familiar with the Norwegian skies, but here in The Netherlands the atmosphere usually limits the magnification to around 200x anyway. A 2" eyepiece has the advantage of giving you a wider field of view. This is nice for some large deep-sky objects or just cruising around the skies. Have fun and let uw know about your experiences with the new telescope!
  13. Great, enjoy! Remember that even at 100x the planets are quite small and need a steady atmosphere and some experience to discern all the subtle details. But you'll gain this experience very fast
  14. Hi, and welcome! Yes, to see details on the planets and the Moon you'll need quite a bit of magnification. The angular resolution of your telescope (smallest details that can be resolved by the scope) is about 1.15 arcseconds. To magnify that so it can be discerned by someone with a decent eyesight, you'll need a magnification of about 100x. In your case, that's an eyepiece of 6 mm. You can always magnify more, but this won't resolve more details - resulting in a larger but more blurry and also darker view. In some cases this is helpful, for example to see some subtle contrast differences or to split very close double stars, but I personally mostly enjoy the sharper, lighter views. I'm not familiar with the Sky-Watcher eyepieces from your link, but I'm pretty sure there are some decent 4-6 mm eyepieces available for your budget. Good luck, and above all, enjoy your views!
  15. Excellent advice here. If you want to get an idea of what to expect visually, visit the Sketching forum.
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