Astronauts Fix Phantom Space Station Ammonia Leak

In the end it is a matter of what you want to do with the spacecraft. Unmanned spacecraft are cheap and reliable. Manned craft are a little more flexible, but expensive and unreliable.

Unmanned spacecraft are cheap and reliable? Not really. We've had plenty of accidents. Keep in mind that up to the year 2000, the US, Soviet Union, and Japan had launched 43 probes to Mars and 13 were successful. That's a 30% success rate. Not all that hot.

In 2012 dollars, we've spent 12.5 billion--with a B--dollars on Mars exploration. And we've learned a lot. Now, we'll say that a manned mission costs 1000x that, or 12.5 trillion--with a T. The interesting question is, would we learn 1000x more ab

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/hD6xgrNSEKo/story01.htm

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