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A Deep Space Primer
phil reed writes "With the latest Mars missions still in the news, people might be curious about what it takes to actually run a deep space mission: how a spacecraft is designed, how the communications are handled, what kind of project management is in place to make it all work. The Jet Propulsion Laboratory has a primer online that gives broad general coverage of all aspects of putting a satellite into orbit and how to manage it once it's there. Fascinating reading, with lots of links to more detail."
There are a lot of smart, dedicated, and *unsung* heroes at JPL. NASA tends to get all the celebrity, but JPL deserves it just as much. Thanks to all who are working on our Mars missions and the various other missions that are increasing our knowledge of our universe and ourselves.
It's nice to see that space exploration has come so far in my lifetime. When I was a boy during WWII, travel to Mars, even by machines, was just science fiction, and the stuff of magazine covers. Most of the world's scientists and engineers were at work developing weapons of war, and for some of them, rockets, high altitude airplanes, etc. were allowed projects that laid the foundation for today's space miracles.
Would you really want them back?
The objective of these missions is to learn more about mars.. if we were just interplanetary joyriding, then, yes, I'd want the rover back -- but that's not the case here.
Besides, the rovers are only a small portion of the cost of the mission - even if we could magically get these back for free, it would be worth the effort to build new rovers that incorporate the things learned on previous missions and provide new and different capabilities.
HIV Crosses Species Barrier... into Muppets
This type of careful planning and careful execution is useful for any endeavour with long or expensive feedback cycles. That includes terrestrial tasks like creating nuclear powerplants. Too many engineers have a hands-on, tweak-and-see hacker mentality, where projects like Mars rovers, nukes (and many other projects)need to work as planned right out of the box.
A former boss and engineer had a great story about his early job experience designing circuits for a guided missile. He showed his first circuit design to the boss and the boss noted all the little adjustable pots in the circuit. The boss simply said, "Are you going to fly with that missile to tweak all the pots?"
Although simulations, testing, and prototyping are great, truely great engineering just works because it was designed correctly from the beginning to just work.
Two wrongs don't make a right, but three lefts do.
If you think the cost is mind boggling, you haven't seen what it would cost to if they were designed to return to earth when they were done.
Humans have yet to perform any "Deep space" exploration.
The Voyager missions come the closest, but still remain fairly near home, on any meaningful interstellar scale.
The linked article discusses interplanetary exploration. Quite a bit of a difference.
Doesn't work. The vibrational impulse is passed through the medium in the tube. This impulse goes slower than light.
The only reason we have the rights we have is that people just like us died to gain those rights. -- Cheerio Boy