FIGURE 6. Tanker returns First Rocket Fuel Payload to
Earth Orbit. A 10 Mg Tanker returns about 500 Mg.

FIGURE 7. Rocket Propellant or Fuel fromSpace can fuel the
Fankers going to a Very Near Earth Comet. In which Case only
the Tankers need be launched, not their much Heavier Fuel.

FIGURE 3. Comets contain critically Useful
Materials such as 50% Water, ~5% CO, ~5% CO2,
and 1/2% Bound Nitrogen. Heat liberates or
converts Comet Raw Materials into Rocket Fuels
and Propellants, Plant Food and Construction
Materials.

FIGURE 8. Four Tankers return 500 Mg of Fuel
each, or 2000 Mg.

FIGURE 4. First Visit to Comet sends a Water
Extractor, a Purifier, a Storage Tank and a Space
Tanker to bring Materials back to Earth Orbits. A
Small Nuclear Heat Source enables Extraction.

FIGURE 5. Extractor stores Pure Water in Storage
Tank. The "Waste" Heat from a 20 kW, Nuclear
Electric Generator liberates in excess of 36,000 Mg
during one 4.2 Year Comet Period.

FIGURE 9. A "Gas Station" at HEEO provides either
Water Propellant or Cryofuel. Trips to Mars, the Moon or
elsewhere, or Commercial Interests, could use the Gas
Station.