Who knows what happen with astronaut's health after 500 day in zero gravity ?No one, just guessing...
Quote from: lcasv on 06/07/2017 01:52 pmWho knows what happen with astronaut's health after 500 day in zero gravity ?No one, just guessing...No. https://en.wikipedia.org/wiki/List_of_spaceflight_records#Ten_longest_human_space_flights
Quote from: whitelancer64 on 06/09/2017 04:46 pmQuote from: lcasv on 06/07/2017 01:52 pmWho knows what happen with astronaut's health after 500 day in zero gravity ?No one, just guessing...No. https://en.wikipedia.org/wiki/List_of_spaceflight_records#Ten_longest_human_space_flightsAll of those are less than 500 days. So the answer is no one has done the research.
But it should of course not be done Dr. Mengele style, but for a purpose that makes the risk of discovering the unknown worthwhile. Like spending the time on the Moon or Mars or Mars' moons. Not spending it in a nowhere Gateway.
Quote from: TakeOff on 06/09/2017 11:43 pmBut it should of course not be done Dr. Mengele style, but for a purpose that makes the risk of discovering the unknown worthwhile. Like spending the time on the Moon or Mars or Mars' moons. Not spending it in a nowhere Gateway.So a space-station is like Auschwitz?"Hyperbole. Not just for trajectories."
Quote from: RonM on 06/09/2017 05:15 pmQuote from: whitelancer64 on 06/09/2017 04:46 pmQuote from: lcasv on 06/07/2017 01:52 pmWho knows what happen with astronaut's health after 500 day in zero gravity ?No one, just guessing...No. https://en.wikipedia.org/wiki/List_of_spaceflight_records#Ten_longest_human_space_flightsAll of those are less than 500 days. So the answer is no one has done the research.Those are just single stays. For cumulative time in space, there are currently 19 people over 500 days (soon to be 20 with Peggy Whitson becoming the first woman to reach that mark), the current record holder is Gennady Padalka, who has spent 878 days in space. https://en.wikipedia.org/wiki/List_of_spaceflight_records#Total_time_in_space
I'm also one who is very doubtful about long term <1.0G human viability, however, I think it should be tested.To start with, it would seem very useful to try establishing a long term mouse/rat/etc. colony on the ISS. I realize there are serious logistical issues with this, but we really do need to know more about this stuff.It would be even more useful to have such colonies in a centrifuge so we could see what partial G does.The notion that we should just go to Mars or the Moon and see what happens with human pregnancy seems like a very bad idea.
Twenty mice riding inside Dragon will be examined after their return to the ground to aid researchers studying how spaceflight affects vision and movement.
The mice will come back to Earth inside the Dragon capsule alive, and SpaceX will hand over their transporters to scientists upon return to port in Southern California.
I'm curious what you think the threshold is then? We have strong evidence that long term zero-gravity exposure is harmful long-term in spite of regular exercise, and three centuries of biology research will tell you these effects always exist on a sliding scale.
Quote from: RDoc on 09/12/2017 06:27 pmI'm also one who is very doubtful about long term <1.0G human viability, however, I think it should be tested.To start with, it would seem very useful to try establishing a long term mouse/rat/etc. colony on the ISS. I realize there are serious logistical issues with this, but we really do need to know more about this stuff.It would be even more useful to have such colonies in a centrifuge so we could see what partial G does.The notion that we should just go to Mars or the Moon and see what happens with human pregnancy seems like a very bad idea.The ISS has such a facility already... the JAXA Mouse Habitat Unit or MHU. (http://spaceflight101.com/iss/mouse-habitat-experiment/). I believe it was installed in 2015 but I don't think the first mice arrived until CRS-12 just last month. https://spaceflightnow.com/2017/08/16/station-crew-captures-dragon-supply-ship-gets-early-start-on-unpacking/QuoteTwenty mice riding inside Dragon will be examined after their return to the ground to aid researchers studying how spaceflight affects vision and movement.QuoteThe mice will come back to Earth inside the Dragon capsule alive, and SpaceX will hand over their transporters to scientists upon return to port in Southern California.From what I could tell in that article the centrifuge capability of the MHU wasn't needed for these particular experiments.But anyways... a very small step in the right direction. Hopefully they have some experiments lined up that will use the centrifuge soon.
Also why I favor the SLS derived DSH as the larger diameter would allow for a larger centrifuge for exercising in or small animals could be placed in and observed.
Quote from: Patchouli on 09/13/2017 01:54 amAlso why I favor the SLS derived DSH as the larger diameter would allow for a larger centrifuge for exercising in or small animals could be placed in and observed.If the SLS lifted a 8m diameter DSH I'm not sure that would be a large enough diameter to demonstrate any benefits of spin gravity.For instance, assuming a person laid down along the inside of the outer wall (i.e. 4m from the center of rotation for a 8m diameter vessel) it would take about 5 RPM to create just 0.1 gravity. We obviously lack hard data on what can be tolerated, but I think an 8m diameter vessel is far too small to do micro-gravity testing.Besides, at this point artificial gravity doesn't seem to be a goal for the DSG, especially since the notional missions all seem to be short duration ones, meaning zero G won't be a big problem for missions to our Moon.