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FOOTNOTES

^{1_}My thanks to Ron Sirull,
who pointed this out to me on the CNN Lunar Science message board.

^{2_}The calculation for track
length is based on the equations for acceleration and distance from high
school physics, which you may remember as the following:

v = at
(1)

x = (1/2)at^{2 }(2)

Substituting v/a for t in #2 you get this:

x = (1/2)a(v^{2}/a^{2}) = (1/2)v^{2}/a (3)

Since the track is used both for acceleration and
deceleration, you need twice as much track, so the final equation is this:

x = v^{2}/a

For 1g (9.82 m/sec^{2}) and 8500 kph (2361
m/s) you get this:

x = (2361^{2})/9.82 = 567649.7963m (567 km)

With this basic number (567 km), all you need do
is divide it by the number of gs you intend to accelerate and decelerate
the train with, so at 10gs the number becomes 56.7 km.

^{3_}The Advanced Life Support
and Gravitational Biology group at Kennedy Space Center runs a biomass
production chamber, which has 113 m^{3} of chamber volume.
The chamber contains approximately 20m^{2} of planter area, and
is illuminated with 96 400watt high pressure mercury vapor lamps, for a
total lamp wattage of 38400 watts. This biomass production chamber
generates 50% the food requirement for one person, takes care of
80% of the O_{2}/C0_{2} recycling needed per person, and
260% of the water generation (through transpiration) for one person.
By using the smallest percentage value above, I roughly calculated you
would need twice this chamber volume/planter area per person to supply
the food needs on a moonbase. This implies a 226 m^{3}
chamber volume with 40 m^{2} planter area and lighting power requirement
of 76800watts per person on the moonbase. The data I used comes from
http://bioscience.ksc.nasa.gov/oldals/plant/bpframe.htm
and probably should only be considered a rough guide (Your milage may vary).

^{4_}To continue from footnote
#3, if a 40 m^{2} planter area is illuminated with more standard
grow bulbs, very different figures for a biomass production facility arise.
For instance, incandescent commercial grow bulbs, covering an area of about
9 to 16 square feet (a 3x3 foot square or a 4x4 foot square) can be purchased
in either 250 watt or 400 watt capacities. To illuminate our 40 m^{2}
planter area, about 40 bulbs (or a little less) would be needed, translating
to a power requirement of somewhere between 10 kw and 16 kw per person,
not 77 kw per person, on the moonbase. This doesn't begin to
consider other options, such as flourescent bulbs, or a mix of bulbs.

Also, with a large enough base with a big enough gas reserve, there
is the possibility of letting the plants run at a lower capacity during
the lunar night and at a higher capacity during the lunar day. So
you see, the term, "your milage may vary," readily applies here.