We all know the pictures of the astronauts on the ISS floating around. We also suspect that a lack of gravity is bad for the body as the muscles go weak and such.
Why don’t spaceships just rotate to cause the effect of artificial gravity through centrifugal forces?
Key goals for both moon and mars missions is finding out how much gravity we need. We know we’re much healthier at 1G than in microgravity, but where is good enough? You can’t really draw a straight line to predict it. Does the moon have enough gravity for people to stay healthy long term? Does mars? Where should we set the rotation of a space station with artificial gravity?