爱上海,上海419论坛,上海龙凤419 - Powered by Bernita Daio!

    Geek Answers Why doesnt the ISS have artificial gravity

    • Home
    • /
    • cukiadqk
    • /
    • Geek Answers Why doesnt the ISS have artificial gravity

    Geek Answers Why doesnt the ISS have artificial gravity

    By Admin

    • cukiadqk ,
    • Tags: 上海419论坛Ciara, 上海后花园Juju, 上海后花园Letitia, 上海夜网Anastasios, 上海水磨会所Fabiana, 上海龙凤419Garrick, 娱乐地图Circe, 娱乐地图Nanci, 爱上海419Annie, 爱上海Selina, 贵族宝贝Monster, 贵族宝贝Walter
    • 21 Sep

    first_imgAnyone who follows Commander Chris Hadfield on Twitter (which should be everyone) knows the effects of zero gravity on the body. This physical specimen has used social media to detail the problems with returning to Earth after a lengthy stay on the ISS: bone decalcification and partial muscular atrophy, among other things. For this and other reasons, it might seem like that NASA should invest some money in a system of artificial gravity. So, why don’t they?First, all hypothetical gravity shields aside, the notion of true anti-gravity is off the table for this article. The ability to create and directly control a gravity well would be one of the all-time most fundamental steps forward for physics, and would open the door to everything from levitation to faster than light travel. Right now, it’s pure fantasy — but space-time is a real, potentially deformable quantity, so there’s no reason to think it couldn’t happen in the future. For now, though, we’ll look only at faux gravity due to acceleration.That acceleration can be linear (the backward push into your car seat you feel when speeding up) or rotational. Since we want to be able to stay in one place (and be efficient with our use of fuel) rotational acceleration is the key: spin a portion of the ISS, and astronauts on the interior surface will be thrown out at an angle parallel to the floor. It’s a difficult thing to visualize, but in physics terms the total sum of an infinite number of vectors pointing perpendicular to the radius of a circle is parallel to that radius — or straight out. Basically, they’re being constantly tossed in the direction of rotation, but since the floor is always there to catch them, the ultimate effect is to be pressed into that floor. We call this “pseudo-force” the centrifugal force. It’s not actually a force acting out, but that’s the ultimate effect.There are some problems with applying this in real life. First and foremost: there is virtually no research about the long-term effects of such a system of artificial gravity. Though it works in theory, NASA is certainly not going to subject their astronauts to long periods of rational gravity without significant research into how their bodies might react. A mission to test the effects on mice was planned a few years ago, but was ultimately defunded and cancelled before launch.Another problem is that we do know of adverse effects that arise at high rotational rates of speed. The Coriolis Effect has to do with rotating reference frames and it can seriously screw with the inner ear. The only way to maintain a strong centrifugal gravity while keeping rotational speed low is to lengthen the system as a whole — but the ISS isn’t nearly big enough. The BBC’s recently proposed Mars vehicle would expand on a tether to get a wide enough rotational diameter. The ideal for humans would be under 2 RPM, but to achieve one Earth’s gravity at 2 RPM the radius of the system would have to be over 200 meters! That means the ISS is currently about a quarter the width we’d require, though we could rotate a little faster, or settle for less than 1G, to shrink the system a bit.This motorcycle cage would work just as well if the bikes were stationary and the cage was rotating.Then there’s the fact that NASA has to be as stingy as possible with these missions. It’s not just about money; the weight of the extra fuel needed to ramp up a spinning portion of the ISS, and maintain that spin, could be used for other, more mission-critical things. And once the ISS is spinning, how do we interact with it? Assuming we don’t want to have to match its rotation to dock, we’d need a variable-speed airlock to allow humans and objects to move from the stationary to rotating portions of the station. A seemingly simple innovation leads to dozens of small, expensive little problems that need fixing.Finally, though we are making huge strides in the area of space research, keeping humans alive in space is still really difficult. In general, when multiple human lives float in the balance, NASA rightly opts for the option with the fewest possible complications. Besides — there’s not much of an advantage to keeping people in orbit for significantly longer than we already do. It’s only for much longer stays that we’d really need artificial gravity.Eventually, it will be a necessity. Today, however, it would be an arguably irresponsible pursuit of sci-fi coolness at the expense of both taxpayers’ wallets and astronauts’ safety.last_img

    Leave a Reply Cancel reply

    Your email address will not be published. Required fields are marked *

      Recent Posts

    • Union Bank Announces New Hires

      01 January 2021

    • VBSR Welcomes New Hire, Tara Pfeiffer-Norrell

      01 January 2021

    • Blue Cross Vermont takes action to open access to H1N1 flu vaccine

      01 January 2021

    • Blue Cross of Vermont announces collaboration with Choice Care Card of Waterbury

      01 January 2021

    • Final regulations will strengthen 8(a) business development program for small businesses

      01 January 2021

    Recent Comments

      Archives

      • January 2021
      • December 2020
      • November 2020
      • October 2020
      • September 2020
      • August 2020
      • May 2020
      • February 2020
      • January 2020
      • December 2019
      • November 2019
      • October 2019
      • September 2019
      • August 2019
      • July 2019
      • February 2019
      • January 2019
      • December 2018
      • November 2018
      • October 2018
      • September 2018
      • August 2018
      • July 2018
      • June 2018
      • May 2018
      • April 2018
      • March 2018
      • February 2018
      • January 2018
      • December 2017
      • November 2017
      • September 2017
      • August 2017
      • July 2017
      • June 2017
      • May 2017
      • April 2017
      • March 2017
      • February 2017

      Categories

      • ancsqaie
      • atvpjgvi
      • bcongbdl
      • cukiadqk
      • dfuvkkzq
      • dyozqglk
      • eswimvio
      • fhcwlcre
      • hacimwdw
      • jbliycpr
      • jyrlbcac
      • lkituini
      • lytncosp
      • optbnofm
      • qucrcmry
      • rvxcvfwb
      • srbwztfm
      • teazupkl
      • tztghzui
      • uoqlmdqb
      • xlhrkxbe
      • ysxvxzir
      • zijvbkaj
      • zrnpcmud

      Meta

      • Log in
      • Entries feed
      • Comments feed
      • WordPress.org

      Powered By Impressive Business WordPress Theme