urn:nasa:pds:context:instrument:clipper.mas 1.0 1.19.0.0 Product_Context MASPEX 2023-05-08 1.0 Initial version. urn:nasa:pds:context:instrument_host:spacecraft.clipper instrument_to_instrument_host MAss SPectrometer for Planetary EXploration (MASPEX) Mass Spectrometer -159002 MASPEX will analyze gases in Europa’s faint atmosphere and possible plumes. It will study the chemistry of the moon’s suspected subsurface ocean, how ocean and surface exchange material, and how radiation alters compounds on the moon’s surface.