Green House Plan

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.

Additional resources for greenhouses

	Greenhouse Grower
	Availability:	Usually ships in 2 to 4 months
	Manufacturers)	Meister Publ Co
Price: $36.00

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