Originally Posted by
Durandal
Obviously such a heated greenhouse isn't quite up to the required standards just yet
The question there is how it's being heated. If we had to grow them in space, heating could be taken care of entirely through solar power, at least as long as the facility is located near enough to the sun. You wouldn't even need to rely on sunlight - there are existing LED-based lighting technologies to give plants exactly the light energy they need (at just the right spectrum, intensity, etc.), so that they could be grown pretty much anywhere. The eternal problem, though, is sustainable energy.
Locating it in space brings a whole 'nother raft of problems
no gravity
finite closed system which is easily disordered
no gravity
cosmic radiation
no gravity
meteorites
no gravity
big unfriendly vacuum that has to be kept OUT
no gravity
Getting all of that stuff out of a deep gravity well in the first place
Start to see the problems - plural. If you want to swap Earth for space then start doing some BASIC research - we have a long long way to go before we can build Babylon 5
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