QUESTION TEXT: The only physical factor preventing a human…
QUESTION TYPE: Necessary Assumption
CONCLUSION: We can go to Mars, and come back.
REASONING: A new device lets a spaceship refuel on Mars. Previously, a spacecraft with enough fuel to return from Mars would have been to heavy to launch.
ANALYSIS: The argument is assuming we can launch a spacecraft with enough fuel to return from Mars.
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- It doesn’t matter how much fuel is needed to return, as long as this device lets us make it on Mars.
- The fuel’s composition doesn’t matter, as long as it works.
- I’m sure the crew can give up a little living space. As long as there’s enough space for the device and the crew, everything will work out.
- The argument didn’t say we should go to Mars, or that it would be cheap to go there. The author just said it’s now possible.
- CORRECT. The fuel tanks were too heavy, so the device will also be too heavy if it weighs more than the fuel tanks it is replacing.
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