control center at the Jet Propulsion Laboratory in Pasadena during the rovers' landing and the first three months of initial data collection. Phoenix 2007 In 2007, Madsen's team was invited by NASA to design the three radiometric calibration targets for the Phoenix mission called "Improved Sweep Magnet Experiment" (ISWEEP). The target consisted of an aluminum holder (carrying structure) containing a palette of different calibrated colors of synthetic pigmented rubber with "sweeping magnets" underneath to clear the colored material of the magnetic Martian dust, assisting in calibrating the cameras of the mission References External links Lecture on Martian dust Lecture on Mars missions MARS: The Phoenix Mission, Part 1 MARS: The Phoenix Mission, Part 2 MARS: The Phoenix Mission, Part 3 1957 births Living people Danish physicists Academic staff of the University of Copenhagen