Word: attainability
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Dates: during 2000-2009
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...once again--that NASA's remote-control system to land its unmanned spacecraft softly on other planets incorporates unacceptable limitations. The best stage in the exploration of Mars will lie in a manned mission. But this can't happen until there are significant breakthroughs in rocket-fuel flights to attain far higher speeds. All exploration of Mars should be put on hold. The Red Planet can afford to wait. If life ever existed on that icy, parched-dry, dead world, it petered out not less than 3 billion years ago. CARLOS MELENDEZ Oceanside, Calif...