Path: ...!news-out.netnews.com!news.alt.net!us1.netnews.com!3.eu.feeder.erje.net!feeder.erje.net!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 16:10:18 +1100 Organization: A noiseless patient Spider Lines: 212 Message-ID: References: <34h1vihp32geb2olkcscfksbr8k0bdgdmu@4ax.com> <6so8vi148t04904oi0knbjphrp7jbj40qq@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 05:10:39 -0000 (UTC) Injection-Info: dont-email.me; posting-host="37d45a7ee1094ad17f279ca263059310"; logging-data="2892299"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+UtgU9T6v1GRcYQfCrDgnahlND8jzhuRk=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:InhUer7L4OiMl7ZAvLJ5RuGOMkM= In-Reply-To: Content-Language: en-US Bytes: 10674 On 16/03/2024 6:15 am, Jeroen Belleman wrote: > On 3/15/24 16:11, John Larkin wrote: >> On Fri, 15 Mar 2024 13:11:29 +0100, Jeroen Belleman >> wrote: >> >>> On 3/15/24 10:35, John Larkin wrote: >>>> 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. >>>> >>> >>> And we are skeptical of your intelligent design stance. For that >>> matter, there are quite a few blunders in living beings that an >>> intelligent designer wouldn't have made. >> >> What you call my "stance" is one conjecture. I have others that you'd >> approve of even less. >> >> Our cells are extraordinary, so their creation might have been an >> extraordinary process. Refuse to think about possibilities if that's >> your style. >> >> There are youtube videos about cell replication that are mind >> boggling. It doesn't work until a zillion fiendshly complex things all >> work, and the cell defines them for itself. >> >> Thinking about possibilities helps electronic design too. > > There are lots of chemists and biologists who think that self- > replicating RNA is a credible step on the path towards evolving > life. There is no need for the seeds of life to have come from > elsewhere than earth, although that possibility is not excluded. > > It's remarkable that the reproduction of RNA and DNA still today > can be made to work simply by cycling the temperature of the right > mixture of chemicals, much like day and night cycles, as may well > have happened on a young earth. > > To our current knowledge, actual intelligent designers are even > less probable than random mutations producing a working cell. How > did the intelligent designers come to be? They would have been > subject to the same kind of constraints as life on earth, the > right conditions and enough time. > > In fact, as long as we haven't found evidence of life elsewhere > in the universe, we can't have any real idea of how common or rare > it is. However, we *can* be pretty confident that *intelligent* > life is at least a few million times less likely than just any > life. On those grounds, I have less trouble believing in evolution > than in intelligent design. > ========== REMAINDER OF ARTICLE TRUNCATED ==========