Thermal Engineer, Deepak Patel, reviews test plans and inspects the Ocean Color Instrument (OCI) in the thermal vacuum chamber prior to the door for the instruments sixty day thermal test to ensure it will perform effectively once it launches into the airless environment of space. OCI is a highly advanced optical spectrometer that will be used to measure properties of light over portions of the electromagnetic spectrum. It will enable continuous measurement of light at finer wavelength resolution than previous NASA satellite sensors, extending key system ocean color data records for climate studies. OCI is PACE's (Plankton, Aerosol, Cloud, ocean Ecosystem) primary sensor built at Goddard Space Flight Center in Greenbelt, MD.