Images Mars 2020 SHERLOC Calibration Target June 12, 2019 Calibration Target for the Mars 2020 Scanning Habitable Environ-ments with Raman & Luminescence for Organics & Chemicals (SHERLOC) Instrument. The next Mars rover, Mars 2020, will include the Mars 2020 SHERLOC Calibration target. Credits NASA/Johnson Space Center ENLARGE