1 Exploration Traffic Model & Launch Cost Comparison October 31, 2001

2 Comparison Assumptions  Ops, dev, and Manufacturing costs equivalent (i.e. not shown).  Return of crews on ISS logistics flights are not shown for either case.  SEP/HPM/CTM/LL logistics flights not counted in either case.  STS capacity – 15000 kg  Delta IV Heavy capacity – 35000 kg  EX version requires STS launch for Logi-pack and crew.  HPM version assumes crew is launched during ISS logistics flight. STS launch is not counted.  EX version uses disposable LL's with re-usable SEP's for L1 transfer.  HPM version uses re-usable LL and SEPs.  Reusable Lunar Lander fuel capacity – 25000kg  90 days is assumed for HPM and LL checkout + LL mission + contingency for ISS return.  LL refueling SEPs stay attached to HPMs for ease of planning and execution. The number of HPMs and SEPs could be reduced by changing this assumption.

3 Inbound HPM/SEP HPM/SEP Available for commercial/DoD missions -270 days 0 6 Mths 1 yr 18 mths 2 yrs 30 mths Outbound HPM/SEP Lunar mission (CTV/CTM out/in) Reusable Lunar Lander w/HPM’s Crew Transfer HPMs HPM1/SEP1 HPM2/SEP2/LL Fuel HPM3/SEP3 HPM4/SEP4/LL Fuel HPM5/SEP1 HPM2/SEP2 HPM4/SEP4 HPM6/SEP5 HPM5 out/HPM1 back HPM1 out/HPM3 back HPM3 out/HPM6 back HPM6 out/HPM5 back HPM7/SEP6/LL Fuel HPM5 out/HPM1 back HPM3/SEP5 HPM7/SEP6 HPM2/SEP2/LL Fuel HPM1/SEP3 HPM5/SEP1 HPM6/SEP1 HPM5/SEP3 HPM2/SEP2 2 3 4 5 1 Lunar Mission # G/W, LL, & SEP 2 2 LL Refueling 2 D-IV-H Launches 4 D-IV-H Launches 2 D-IV-H Launches

4 2 3 4 5 1 Lunar Mission # # of Delta-IV Heavy Launches Outbound Configuration Inbound Configuration 2 2 2 2 2 2 0 0 0 0 HPM1 – SEP1 HPM2 – SEP2 – LL Fuel HPM7 – CTV – CTM HPM3 – SEP3 HPM1 – CTV – CTM HPM4 – SEP4 – LL Fuel HPM5 – SEP5 HPM3 – CTV – CTM 2 HPM6 – SEP6 – LL Fuel HPM7 – SEP1 HPM5 – CTV – CTM HPM2 – SEP2 – LL Fuel HPM1 – SEP3 HPM7 – CTV – CTM0 HPM1 – CTV – CTM HPM7 – SEP1 HPM2 – SEP2 HPM3 – CTV – CTM HPM1 – SEP3 HPM4 – SEP4 HPM5 – CTV – CTM HPM3 – SEP5 HPM6 – SEP6 HPM7 – CTV – CTM HPM5 – SEP1 HPM2 – SEP2 HPM1 – CTV – CTM HPM7 – SEP3 2LL/GW/SEP 6 0 0 0 0 0 HPM4 – SEP4 – LL FuelHPM4 – SEP4 HPM3 – SEP5HPM3 – CTV – CTM HPM1 – CTV – CTMHPM1 – SEP5

5 -6 Mths 0 6 Mths 1 yr 18 mths 2 yrs 30 mths Outbound LL/SEP SEP Return JSC EX Concept Lunar mission (LTV out/in) G/W & SEP SEP1/LL1 SEP2/LL2 SEP2/LL4 SEP1/LL3 SEP1 SEP2 SEP1 SEP2 SEP1 2 3 4 5 1 Lunar Mission # SEP1/LL5 1 D-IV-H Launch 3 D-IV-H Launches, 2 Shuttle Launches 3 D-IV-H Launches, 1 Shuttle Launch 2 D-IV-H Launches, 1 Shuttle Launch

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7 Backup