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Brings us to discussion of NASA's future program of scientific observation: mission to planet earth. Program through 90's to take advantage of our space program to undertake a comprohensive [[comprehensive]] study of our own planet.j [earth probes, like TOMS, TRMM, ERBS] ERBs - solar radiation incident on the Earth, and that re-readiated by the earth. (recently: information on the role of clouds in total heat balance [overall cooling]) [polar platforms - simultaneous measurements: atmosphere, ground, vegetation cover, cloud cover, ocean chlorophyll, etc.] message: As we've developed the capabilities to explore other worlds, we have also acquired the ability to explore our own world in a way that was impossible only a few decades ago. 3