Born Hunter 17,910 Posted February 17, 2021 Report Share Posted February 17, 2021 15 minutes ago, Greb147 said: Water Could Shield Mars Bound Astronauts And Colonists From Harmful Radiation | HuffPost WWW.HUFFPOST.COM A couple of years ago, on a press tour of NASA’s Johnson Space Center (JSC), one of the lead engineer’s of the Orion... We use a similar principle at work with neutrons. They interact most with hydrogen. So water is a better shield than lead. It's the other way around with gamma rays though. They tend to interact with electrons in varuous ways and electron density is roughly proportional to bulk density. Hence lead is better for gamma. It's a bit more complicated than all that of course. Radiation and radiation safety isn't really a simple case of 'common sense' unfortunately. 2 Quote Link to post Share on other sites
mushroom 14,100 Posted February 17, 2021 Report Share Posted February 17, 2021 21 minutes ago, Greb147 said: Water Could Shield Mars Bound Astronauts And Colonists From Harmful Radiation | HuffPost WWW.HUFFPOST.COM A couple of years ago, on a press tour of NASA’s Johnson Space Center (JSC), one of the lead engineer’s of the Orion... Best way to think about it, is light in water. How deep do you have to go before there is no more light? But even so, water is dispersing it and spreading it about (interaction). Radiation penetrates a lot deeper, straighter and harder. It moves through things easier than lightwaves. Like being hit by billions of bullets, it's gonna leave damage and water won't help. At least by my understanding of physics Quote Link to post Share on other sites
Born Hunter 17,910 Posted February 17, 2021 Report Share Posted February 17, 2021 11 minutes ago, mushroom said: No more likes mate but you just got me wet Helium 3 is where it's at Crazy fact for everyone... the world is running out of Helium. Helium is used in MRI scanners aswell as balloons and is only made in stars. So when its gone, it's gone. The militarisation and Commercialisation of space, I find fuucking daft and incomprehensible! Starship troopers all over again The benefit should be for all, not just Rio Tinto, mining corps' or private investors Think more star trek and less Aliens I think our steps towards becoming a space faring species will be reminiscent of our steps to becoming a sea faring species. Space will be treated very similar to the seas in terms of commerce and law I'd expect. How physical bodies are treated might be more like land and be reminiscent of imperialism but that's all some way away. Quote Link to post Share on other sites
mushroom 14,100 Posted February 17, 2021 Report Share Posted February 17, 2021 1 minute ago, Born Hunter said: I think our steps towards becoming a space faring species will be reminiscent of our steps to becoming a sea faring species. Space will be treated very similar to the seas in terms of commerce and law I'd expect. How physical bodies are treated might be more like land and be reminiscent of imperialism but that's all some way away. Unless we bump into klingons or the Borg It's crazy to think we are taking the baby steps to go out there now... but we really have no fuucking clue what's at the end of the ocean! Will we fall off, get twatted by natives, stumble into a war, create new war or grow wheat on Europa lol. Mind blowing Crazy question, do you think FTL travel is possible? Quote Link to post Share on other sites
Born Hunter 17,910 Posted February 17, 2021 Report Share Posted February 17, 2021 3 minutes ago, mushroom said: Best way to think about it, is light in water. How deep do you have to go before there is no more light? But even so, water is dispersing it and spreading it about (interaction). Radiation penetrates a lot deeper, straighter and harder. It moves through things easier than lightwaves. Like being hit by billions of bullets, it's gonna leave damage and water won't help. At least by my understanding of physics There's different types of radiation to be concerned about. You're focussing on electromagnetic. The article is talking specifically about particulate radiation. Both are consideration in space. Water is actually pretty good at stopping EM, it's why submarines are such c**ts to find or communicate with and ASW is all about sonar and not radar. BUT yes the volume of water required to stop EM is much more than dense stuff like lead or concrete etc. Quote Link to post Share on other sites
mushroom 14,100 Posted February 17, 2021 Report Share Posted February 17, 2021 1 minute ago, Born Hunter said: There's different types of radiation to be concerned about. You're focussing on electromagnetic. The article is talking specifically about particulate radiation. Both are consideration in space. Water is actually pretty good at stopping EM, it's why submarines are such c**ts to find or communicate with and ASW is all about sonar and not radar. BUT yes the volume of water required to stop EM is much more than dense stuff like lead or concrete etc. Waves and Rays mate Quote Link to post Share on other sites
Born Hunter 17,910 Posted February 17, 2021 Report Share Posted February 17, 2021 1 minute ago, mushroom said: Crazy question, do you think FTL travel is possible? I don't know that it's impossible and there are a few ideas but it's so blue sky that it's impossible to answer. Quote Link to post Share on other sites
mushroom 14,100 Posted February 17, 2021 Report Share Posted February 17, 2021 2 minutes ago, Born Hunter said: I don't know that it's impossible and there are a few ideas but it's so blue sky that it's impossible to answer. Aye, when I was studying maths, I had a prof who claimed to genuinely believed it is possible. When asked to show the formula he always said it can't be written down because it's not in this dimension took me a while to understand what he meant. We are such children our understanding of maths and physics is ridiculously low and primitive Quote Link to post Share on other sites
Greyman 31,762 Posted February 18, 2021 Report Share Posted February 18, 2021 11 hours ago, Greb147 said: Let's talk science, or conspiracies for those who can't grasp it.... My understanding it’s a bit like wrapping my shopping in silver foil so I can pass through the security barriers at supermarkets undetected , but beyond that, I,ll stay in my lane 5 Quote Link to post Share on other sites
mushroom 14,100 Posted February 18, 2021 Report Share Posted February 18, 2021 1 hour ago, Greyman said: My understanding it’s a bit like wrapping my shopping in silver foil so I can pass through the security barriers at supermarkets undetected , but beyond that, I,ll stay in my lane That's called shoplifting mate 1 Quote Link to post Share on other sites
Born Hunter 17,910 Posted February 18, 2021 Report Share Posted February 18, 2021 (edited) Coincidentally (or maybe not) JPL's Perseverance Rover is scheduled to land on the Martian surface today. Quote The Perseverance rover has four science objectives that support the Mars Exploration Program's science goals: Looking for habitability: identify past environments capable of supporting microbial life. Seeking biosignatures: seek signs of possible past microbial life in those habitable environments, particularly in special rocks known to preserve signs over time. Caching samples: collect core rock and "soil" samples and store them on the Martian surface. Preparing for humans: test oxygen production from the Martian atmosphere. Edited February 18, 2021 by Born Hunter tempting fate 1 Quote Link to post Share on other sites
chartpolski 28,005 Posted February 18, 2021 Report Share Posted February 18, 2021 2 hours ago, Greyman said: My understanding it’s a bit like wrapping my shopping in silver foil so I can pass through the security barriers at supermarkets undetected , but beyond that, I,ll stay in my lane Just shop at my local asda, mate........nobody even looks up when the alarm goes off. Cheers. 1 Quote Link to post Share on other sites
mushroom 14,100 Posted February 18, 2021 Report Share Posted February 18, 2021 5 hours ago, Born Hunter said: Coincidentally (or maybe not) JPL's Perseverance Rover is scheduled to land on the Martian surface today. Aye I saw this this morning... defo exciting times Quote Link to post Share on other sites
steve66 3,756 Posted February 18, 2021 Report Share Posted February 18, 2021 5 hours ago, Born Hunter said: Coincidentally (or maybe not) JPL's Perseverance Rover is scheduled to land on the Martian surface today. live on youtube tonight from 19.15 1 Quote Link to post Share on other sites
Greb147 6,810 Posted February 18, 2021 Report Share Posted February 18, 2021 1 minute ago, steve66 said: live on youtube tonight from 19.15 Is that martian time? 1 3 Quote Link to post Share on other sites
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