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3 TYPES of INSTRUMENTS (all measure light) - CAMERAS (IMAGE IN VISIBLE LIGHT) - IR "CAMERAS" (IMAGE IN IR LIGHT) (heat) T-differences - SPECTRUM -> diff object/materials have diff. characteristic spect. - RADARS -> send down a pulse bounce off Earth; receive it TOPEX-POSEIDON 1) altimeter [[image]] (straight down) SIR-C 2) SLR [[image]] measure of roughness of terrain e.g. Magellan VARS - atmospheric: molecules and atoms -> NOW: WHAT CAN YOU SEE?