With patience, the ion propulsion system on Deep Space One imparts about 3.6 km/s to the spacecraft. To undertake the same mission with a chemical propulsion system would require a more expensive launch vehicle and a larger spacecraft to accommodate a large tank for the chemical propellants.'"Again Karl switched slides.This slide has a couple of interesting questions. "How much time would a spacecraft using ion propulsion take to get to Mars? Can the technology be used for a manned mission to Mars? The answers will depend on choices and goals. Ion propulsion could be used for a manned mission to Mars. The decision on whether that would be the preferred approach would involve many questions such as which technique might get the crew there the fastest (independent of how fuel efficient the trip might be) in order to reduce the radiation exposure and effects of long periods of near weightlessness."Karl smiled when he saw the question on this screen.I grinned at Karl's reaction. Typical. ‘Because you’re not a bad person. Because you committed a mistake once.”, answered Isabelle. “And also because of old time’s sake’, added Geneviève who referred in that way to their initial relationship. Geneviève went first to the bed. They kept Annie tied down. Geneviève fucked her while Isabelle watched. It was a formal fuck, no emotion, no kissing, just a fuck. Then Isabelle took over. They did the same thing. Both women had their orgasm at the end. It was like a souvenir. Something to remember, but not great enough to remember it for ever. They untied her and dressed her. She took her suitcase and the address in Lyon. Isabelle and Geneviève stayed inside as Annie walked down the steps slowly to the street. She looked back to see if there was someone at the window, but there was no one. She looked at the building to remember. Then she walked to the train.
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