Science instruments built at The University of Arizona in Tucson are now halfway to Mars aboard the Mars Polar Lander, and they’re doing just fine, according to checks made yesterday. Lunar and Planetary Laboratory (LPL) scientists learned yesterday that their instruments, a collection of ovens called TEGA, for Thermal and Evolved Gas Analyzer, their Stereo Surface Imager (SSI) and Robotic Arm Camera (RAC) survived the Jan. 3 launch from Earth to the Red Planet.