Author: NASA
Greenhouses resemble living organisms. They consume sunlight,
excrete waste heat, and cope with the force of artificial gravity. A
small greenhouse shaped like a sphere can perform these tasks well,
but a large greenhouse must have a complex shape and a complex system
of mirrors guiding sunlight into its interior. When the diameter of
the spherical greenhouse is doubled, its internal area is quadrupled,
its mass is increased 8 times, and its cost per square meter of
internal surface is doubled. A large greenhouse shaped like a torus,
spiral, helix, or band can sustain a great diversity of species and
commercial services, but is afflicted by human conflicts and pests.
A slender cylindrical greenhouse has a high ratio of internal
horizontal surface to volume. On the other hand, it is unstable
unless attached by a bearing to other spinning greenhouses. This
instability is caused by the tendency of a freely spinning object to
change its axis of rotation until it rotates about the axis having
the greatest moment of inertia. A large cylindrical greenhouse fails
catastro....[MORE]
Hold those chemical sprays, says Val Bourne. Take care of your ladybirds, and these aphid-eating machines will look after you.
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