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Halcyon Daze

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Posts posted by Halcyon Daze

    Frost tolerant Trichocereus?

    in Cacti & Succulents

    Posted

    I see this is an old thread but I'll add my 2 cents.

     

    To help mitigate any frost issues you could consider using a double raised bed, avoid building a cactus garden in a frost hollow, use shelter from nearby trees (Trichs seem to grow well among gum trees). plant companion plants/ succulents around the base of the cacti, keep them bone dry. If it looks like a shocker frost is about to hit consider wrapping trunks in hessian/ plastic/ newspaper, and you can also place some clear plastic cups or containers over the tips for a few days. The more you put in, the more you get out, and those who go the extra mile with their cactus gardens usually end up with something that looks so incredibly awesome, that all the hard work seems totally worth it in the end.

    Will treated timber kill my native trees?

    in Australian Native Plants

    Posted

    Not toxic to plants from what I know, but I don't like the 'sound' of any kind of wood up against a eucalyptus. They can be sensitive to fungal pathogens in the lower trunk/roots which may have been involved. 

     

    I've used hundreds of treated sleepers over the years and haven't had any problems from them. Can't say they were ever touching a trunk though, so I don't really know for sure.

    higgs particle, superfluids disscussion

    in Chill Space

    Posted · Edited by Halcyon Daze

    On 22/11/2021 at 11:28 AM, withdrawl clinic said:

     

    when i was a boy and started out with astronomy, people said, one cannot build bigger telescopes than mount palomar.

    but with computers help we can now.

     

     

     

    Sorry if this doesn't answer any of your questions.

     

    I think that the reason they say Mt Palomar is like the maximum size for a telescope (on earth) is that interference from earth's atmosphere makes the images blurry when zooming in on the most distant objects. So the Hubble and James Webb can overcome this problem by being outside the earth's atmosphere.

     

    They could hypothetically make a telescope as big as they want out in space and the image quality would improve the bigger they make the lens/mirror, but then warping from gravity would also degrade the quality of the image, and be very hard and expensive to overcome.

     

    That's where computers come in. If the image is digital they can process the information to artificially remove the blurryness, and give a better idea of what it really looks like. It's certainly an improvement on those distant blurry objects. And maybe the James Webb will help them calibrate their computer processes to become even more acurate.

     

     

    Also objects in space fall differently to objects on earth due to resistance from the air, so that's why a feather and a hammer fall at the same speed on the moon, because there is very little wind resistance form the negligable atmosphere.

     

    As for light, I always thought it had a very tiny amount of mass, and that's why it can't escape black holes, but that theory might have been updated, not sure.

     

    • Like 1

    Meet up: Ipswich

    in News & Notices

    Posted

    We should do some kind of mega-meet. Sunny coast crew, Goldie, Bris, Nth Nsw etc. All come in for a big get together at Wivenhoe and camp the night. Maybe not during Chrissy holidays though. Just a thought anyway. :)

    • Like 2
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