Dust in the Upper Stratosphere Tracking Experiment and Retrieval (DUSTER) is an instrument that aims to collect uncontaminated solid aerosol particles from the Earth's stratosphere (30–40 km).
The main target of DUSTER is the collection of extraterrestrial dust: (sub-)micrometric particles originated from different bodies of the Solar System (and potentially even beyond).
Collecting extraterrestrial dust with DUSTER allows us to have unaltered (since not subjected to alteration processes) and uncontaminated (thanks to the DUSTER's collection system) samples of primitive bodies of the Solar System - a priceless reservoir for our labs.