Watching the returning Astronauts be carried away on stretchers after being stuck on the ISS for 9 months only reinforced my belief that after 9 months travelling to Mars, the astronauts would be in no fit state to do anything once they got there although if they could somehow make a space ship that simulated the Earth's Gravity we may have a chance but how fast would something have to spin to artificially duplicate the Earths Gravity?
The scientists at the European Space Agency have always been very helpful when I have Space type questions so I emailed them and asked the question to them and they were very quick to reply with an answer but I still have no idea.
There was a bit about Centrifugal and Coriolis Forces and an object rotating about its own center of mass so artificial gravity could therefore be generated in the following ways but in order for a spacecraft to spin about its axis to achieve 1 g would require the mass of the Earth.
We then hit Instantaneous linear velocity added to the tangential velocity of the vehicle...centripetal acceleration...angular and tangential velocity...Coriolis force that results from the astronaut’s velocity in the rotating frame...linear velocity vector v of the moving object...Coriolis acceleration is perpendicular to the plane formed by ω and v in a right-hand-rule sense in accordance with vector calculus or F = 2m ω v...rotation rate should not exceed about 0.1 rpm to stay completely below the threshold of vestibular illusions and nausea due to cross-coupling accelerations... 0.1 rpm a 1-g spinning station would need a radius of about 90,000 meters...maximum station rotation rate of 6 rpm brings the radius of a 1-g station down to only 25 meters or 4rpm for a 50m craft.
There you go then 6 revolutions per minute for a 25 meter Spaceship or 4rpm for a 50m one or build one with the mass of the Earth but remember to allow for vestibular illusions and angular and tangential velocity obviously, would be daft not to.
Wednesday, 26 March 2025
Vestibular Illusions And Angular Velocity
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a major physiology issue is neck bone density. the bones from the shoulder to the base of the head deteriorate rapidly in low gravity.
when you see astronauts walking on a tread mill (common image from space stations) they have elastic bands attaching and pulling them toward the tread mill. this causes pressure on bones which leads the body to maintain bone density. likewise, astronauts do other exercises to maintain bone density. however, an exercise has not been found to maintain neck bone density.
at age 55, my former boss, John Blaha, spent 120 days on the mir space station. he told us he had normal bone density for a 55 year old male when he went to the mir, but his neck bones declined to the density of a 85 year old woman while in orbit.
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