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Comment Re:Not trying hard enough... (Score 1) 441

I'm pretty sure the "4" comes from mapping the letter grades A, B, C, D, F. "A" has the most points (4) and "F" the least (0). Most of the time -- but not always -- the letter grades have already been mapped from a numerical scale or percentage, e.g., A=[90-100], B=[80-89], C=[70-79], D=[varies?], F=[can't fudge a D].

Comment Re:Ask Slashdot question in the making... (Score 3, Interesting) 36

I've even heard it more-broadly stated that there are NO long-term stable lunar orbits. It's an issue for orbital debris: since (1) objects don't burn up on entry, and (2) an uncontrolled orbit is impossible to predict in the long term, therefor all lunar orbiters should be removed rather than abandoned and lunar deorbits should be targeted rather than random.

Comment trade-offs (Score 1) 289

I've heard that, in addition to smoke removal, fresh air (or water) lowers a room's temperature and can prevent flash-over. There must be an optimal solution among the inputs -- people get degrees in this stuff.

Comment Re:What are the military applications? (Score 1) 65

This is the best reply I've read here. I think that back when they built the current system (article says 1961) the military wanted to know where everything was so they could identify the military threats. (You also don't want to launch your counter-strike when that Russian rocket booster burns up over Alaska.) That's still the case, but the use for collision avoidance is becoming more important now. The data go into real-time calculations and also into long-term environmental models.

The data (sure...minus classified) are already available to the public, with the caveat that these are averaged/low-res data not suitable for collision avoidance.

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