Word: shipping
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...carbon dioxide--into a reaction chamber, where it would be exposed to hydrogen and broken down into methane, water and oxygen. Methane and oxygen make a first-rate rocket fuel; water and oxygen are necessary human fuels. All these consumables could be pumped into tanks inside the ship and stored there...
...years later, when Mars and Earth are again in conjunction, another spacecraft--this one carrying a crew--would be sent to join the robot ship on the surface. The astronauts could work on Mars for 18 months, living principally in their arrival craft, and then, at the end of their stay, abandon that ship, climb into the robot craft and blast off for home. "Fly several of these missions," says Robert Zubrin, author of the book The Case for Mars and one of the engineers who developed the plan, "and you leave the surface scattered with a series of warming...
...Pluto. A trip to the stars within a human lifetime requires a spacecraft that cruises at more than 10,000 miles a second and accelerates to this speed within 10 years. The engine would have to deliver about a megawatt of power for every pound of weight of the ship. There is no way an engine that small and that powerful could keep itself cool. Even if the fuel is something exotic like antimatter, carrying far more energy than sunlight or uranium, the problem of cooling the engine remains insuperable. Travel to the stars within this century, using any kind...
...much smaller and lighter than manned spaceships. That means the total power required for a probe to reach the stars is much less. But the unmanned probe still needs an engine delivering one megawatt per pound. The problem of cooling the engine remains the same, whether the ship is manned or unmanned, and the conclusion is the same. Unmanned probes are not going to reach the stars within this century...
Michigan didn't win a single national title in the 90's. Chris Webber cost the Wolverines the 1993 title game by calling a timeout he didn't have, and then he jumped ship to the NBA in only his sophomore year. Jalen Rose and Juwan Howard left the next year, and Michigan's days as a title contender were numbered...