Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Bill Sloman Newsgroups: sci.electronics.design Subject: Re: Shielding spacecraft against cosmic radiation Date: Sat, 16 Mar 2024 15:42:27 +1100 Organization: A noiseless patient Spider Lines: 168 Message-ID: References: <34h1vihp32geb2olkcscfksbr8k0bdgdmu@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Sat, 16 Mar 2024 04:42:45 -0000 (UTC) Injection-Info: dont-email.me; posting-host="37d45a7ee1094ad17f279ca263059310"; logging-data="2882769"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/XFvwdwscAlRhB+e+C8aJ316NsKpbqx3w=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:zaMQk11VK+js6xE50ctzRNk+/sM= Content-Language: en-US In-Reply-To: Bytes: 9115 On 16/03/2024 3:10 am, John Larkin wrote: > On Fri, 15 Mar 2024 15:52:57 GMT, Jan Panteltje > wrote: > >> On a sunny day (Fri, 15 Mar 2024 08:04:17 -0700) it happened John Larkin >> wrote in : >> >>> On Fri, 15 Mar 2024 10:42:50 GMT, Jan Panteltje >>> wrote: >>> >>>> >>>> On a sunny day (Fri, 15 Mar 2024 02:35:27 -0700) it happened John Larkin >>>> wrote in : >>>> >>>>> On Fri, 15 Mar 2024 07:28:39 GMT, Jan Panteltje >>>>> wrote: >>>>> >>>>>> On a sunny day (Thu, 14 Mar 2024 10:38:47 -0700) it happened john larkin >>>>>> wrote in : >>>>>> >>>>>>> On Thu, 14 Mar 2024 16:46:07 GMT, Jan Panteltje >>>>>>> wrote: >>>>>>> >>>>>>>> On a sunny day (Thu, 14 Mar 2024 08:13:31 -0700) it happened John Larkin >>>>>>>> wrote in : >>>>>>>> >>>>>>>>> On Thu, 14 Mar 2024 06:13:43 GMT, Jan Panteltje >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>>> On a sunny day (Wed, 13 Mar 2024 03:54:24 -0700) it happened John Larkin >>>>>>>>>> wrote in : >>>>>>>>>> >>>>>>>>>>> On Wed, 13 Mar 2024 07:09:47 GMT, Jan Panteltje >>>>>>>>>>> wrote: >>>>>>>>>>> >>>>>>>>>>>> On a sunny day (Tue, 12 Mar 2024 14:18:18 -0700) it happened john larkin >>>>>>>>>>>> wrote in <34h1vihp32geb2olkcscfksbr8k0bdgdmu@4ax.com>: >>>>>>>>>>>> >>>>>>>>>>>>> On Tue, 12 Mar 2024 06:22:55 GMT, Jan Panteltje >>>>>>>>>>>>> wrote: >>>>>>>>>>>>> >>>>>>>>>>>>>> Shields up: New ideas might make active shielding viable >>>>>>>>>>>>>> Active shielding was first proposed in the '60s. We’re finally close to making it work. >>>>>>>>>>>>>> https://arstechnica.com/science/2024/03/shields-up-new-ideas-might-make-active-shielding-viable/ >>>>>>>>>>>>>> >>>>>>>>>>>>>> bit of static oelectricity, 1 MV ? >>>>>>>>>>>>> >>>>>>>>>>>>> That's all absurd, cramming a crew into a tiny dark cylinder, deep >>>>>>>>>>>>> inside tons of magnets, to reduce their radiation exposure a little. >>>>>>>>>>>> >>>>>>>>>>>> Yes that may be more dangerus, tha tI why I like the elctrostatic solution. >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>>> Space is not people-friendly. Earth is. >>>>>>>>>>>>> >>>>>>>>>>>>> Traveling to or living on Mars woud be lethal. Living on the moon >>>>>>>>>>>>> would be bad too. >>>>>>>>>>>> >>>>>>>>>>>> Maybe we could convert some comet, live inside it, >>>>>>>>>>>> use its material for power water and shelter >>>>>>>>>>>> and put an engine on it and start interstellar travel: >>>>>>>>>>>> https://en.wikipedia.org/wiki/%CA%BBOumuamua >>>>>>>>>>> >>>>>>>>>>> You go first. >>>>>>>>>> >>>>>>>>>> Oh I would not mind flying the comet thing, would want to have a say in the design and food chosen though. >>>>>>>>>> but it will take generations to reach any target destination. >>>>>>>>>> So you have to bring whole families , >>>>>>>>>> or as things go now, just some skin and have a computah hatch you >>>>>>>>>> and teach you when growing up near the destination. >>>>>>>>>> Makes you wonder if the first life on earth was brought here in a similar way >>>>>>>>>> (circular reasoning). >>>>>>>>> >>>>>>>>> Earth is too good to be an accident, and our life form is too complex >>>>>>>>> to have evolved from inorganics. Other civiizations in the universe >>>>>>>>> have probably advanced for billions of years. So it's likely that >>>>>>>>> Earth and DNA-based life were designed, maybe as a high school science >>>>>>>>> project. I give it a B-. >>>>>>>> >>>>>>>> Well I won't attack your religious beliefs >>>>>>> >>>>>>> I expressed no religious beliefs, and it's good that you wouldn't >>>>>>> attack any. >>>>>>> >>>>>>> RNA World is a religious belief. Concensus and faith without evidence. >>>>>>> >>>>>>> >>>>>>>> Just watched some news story where a sort of computer robot was teaching kids... >>>>>>>> Again, an other science program today on TV about planets: all sort of basic chemistry was found >>>>>>>> on some moons and asteroids. >>>>>>> >>>>>>> Sure. Chemicals are not life, as a junk box full of parts is not a >>>>>>> working electronic instrument. >>>>>>> >>>>>>> >>>>>>>> They did a testing in the lab and made RNA from just basic chemicals added some heat cycling and dry soak cycle >>>>>>>> like you will find on planets (sun, tides): >>>>>>>> https://phys.org/news/2022-03-insight-life.html >>>>>>>> >>>>>>>> we are just a chemical reaction really. >>>>>>>> >>>>>>> >>>>>>> We are an astoundingly complex structure that uses chemicals and >>>>>>> quantum mechanics. At least I am. >>>>>> >>>>> >from elementary particles to atoms to molecules to self-replicating RNA (check) >>>>> >from RNA to DNA and ever more complex forms like us (check) >>>>>> Readup on Darwin >>>>>> :-) >>>>> >>>>> Read up on the ways our cells operate and reproduce. It's astounding. >>>>> >>>>> Darwin was very smart, but he had no idea how cells work. I think that >>>>> if he had, he'd have been skeptical of random evolution and selection >>>>> as our origin. >>>> >>>> Did you actually READ the >>>> https://phys.org/news/2022-03-insight-life.html >>>> link? >>>> It is all very simple. >>> >>> Too simple. It's not DNA, not cells, it's unlikely to continue >>> replicating outside the lab, and, being a lab experiment, is >>> "intelligent design." Well, moderately intelligent. >>> >>> Lots of chemical reactions can be forced to replicate in the lab. >>> >>>> Life is everywhere buzzing >>>> just like electrons around atoms >>>> >>>> The religious leaders have various routines to keep their power and palaces, >>>> suck your money and wash you brain and force you into obedience >>>> Take a step back. >>>> The rain-dances ended when rain-radar was more accurate >>>> Our lifeform has evolved something called 'ego' to protect ourself. >>>> We are not that more complex than that sunshade with photo sensor that has a voice added >>>> so when the sun shines it says 'sun', I am closing, and if no sun, I am opening. >>>> That, in short, is all consciousness is. >>>> Never the less we are all connected, these days via radio and teefee too. >>>> Drop the mystics >>>> >>>> >>> >>> Blind faith hand-waving about random mutation and selection is mystic. >>> Conjecturing about an actual, unlikely but plausible, origin of life >>> is not. >>> >>> One big problem with accounting for DNA life is that an entire class >>> of possible mechanisms is sneered at because considering them invokes >>> the fear of drifting even slightly towards religion, and we can't >>> allow that. You do that, mocking anything that you think might drift >>> in that direction. Dawkins said that he was a capital-A Atheist first, >>> and everything else flowed from that. >>> >>> He was capital-B Boring too, as compulsive believers tend to be. >> >> Well no use educating the brain washed. >> Best of luck special heap of cells. >> It is not bad that 'I' do not know what you babble about., much worse is that 'you' do not know. > > As one rich and famous person said, "Don't be a jerk. Nobody likes > jerks." Advice that John Larkin doesn't realise applies to him. -- Bill Sloman, Sydney