# Artificial Gravity on Luna

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

It is sometimes stated that while artificial space habitats can be adjusted to any level of centripetal force desired, people living on the Earth's moon or Mars would be stuck with the local ambient gravity. However, it is just as possible to build centrifuges on the moon as to provide the other requirements of good health. Eating and sleeping within a centrifuge sized to accommodate living quarters could provide most of the exercise that people need without requiring much extra time from their schedules. Since much power per person will be required to provide air, food and water, the additional power to keep a centrifuge running is unlikely to make the difference between an economic and a noneconomic settlement.

## Contents

### It's Physically Possible

To provide people with one g acceleration by centrifuge on Luna, there needs to be about 99% of a g radially outward from a vertical axis added to the existing one sixth g. If the centrifuge rotates at a reasonable angular velocity of 2 revolutions per minute, the radius must be 220 meters. To avoid providing a room for the centrifuge with an open space (no pillars) of 440 meters in diameter, the hub of the centrifuge can be left out and the living quarters built in a section of a cylindrical space between 220 meters and 210 meters in radius and between 0 and 15 meters in height. The centrifuge could run constantly except when maintenance requires a shut down. Access to the living quarters could be not by elevator, but by rotavator. People could approach the rotavator on their way home after work, moving through the nonrotating corridors of a lunar base. They could enter the rotavator through a door and start it moving along its circular track just above the centrifuged living quarters. When the rotavator is matched in velocity with the proper portion of the living quarters, people would enter the living quarters through a door. The transition from one sixth g vertical to one g radial could be smoothly accommodated by the floor of the rotavator compartment swinging from downward to radially outward. Experiments on Earth have already shown that most people can exercise in and environment that rotates at 2 rpm without ill effects.[1]