SCIENCE GOALS AND OBJECTIVES: IN THE LAST TWO DECADES THE FIELD OF EXOPLANETS HAS WITNESSED A MASSIVE SURGE. RESEARCH IN EXOPLANETS NOW ENCOMPASSES A WIDE RANGE OF FIELDS RANGING FROM ASTROPHYSICS TO GEOLOGY AND ATMOSPHERIC SCIENCE. ONE OF THE PRIMARY OBJECTIVES OF STUDYING EXOPLANETS IS TO DETERMINE THE CRITERIA FOR HABITABILITY AND WHETHER CERTAIN EXOPLANETS MEET THESE REQUIREMENTS. AMONGST THE MANY FACTORS THAT DETERMINE HABITABILITY UNDERSTANDING ATMOSPHERIC LOSSES IS OF PARAMOUNT IMPORTANCE. IN PARTICULAR MOST OF THE ATTENTION HAS BEEN CENTERED AROUND THE STUDY OF EXOPLANETS ORBITING M-DWARFS SINCE THE LATTER ARE HIGHLY NUMEROUS IN OUR GALAXY (AND IN THE UNIVERSE). THE STUDY OF THESE EXOPLANETS HAS ALSO RECEIVED A MAJOR BOOST FROM THE DISCOVERY OF PROXIMA CENTAURI B AT A DISTANCE OF ONLY 4.3 LIGHT YEARS AWAY. THE PRIMARY OBJECTIVES OF THE PROPOSED WORK ARE 1) TO STUDY THE ATMOSPHERIC LOSS AND EVOLUTION OF BOTH UNMAGNETIZED (MARS/VENUS-LIKE) AND MAGNETIZED (EARTH-LIKE) EXOPLANETS THROUGH THEIR INTERACTION WITH THE STELLAR WIND OF THE HOST STAR AND 2) TO STUDY THE ATMOSPHERIC LOSS AND EVOLUTION FOR EXOMOONS (TITAN-LIKE) THROUGH THEIR INTERACTION WITH THE MAGNETOSPHERIC FLOW OF THE HOST PLANET. CONSEQUENTLY THIS WILL BUILD A MODEL LIBRARY THAT WILL BENEFIT THE EXOPLANETARY COMMUNITY. METHODOLOGY: IN OUR SOLAR SYSTEM THE MOST SOPHISTICATED CODES TEND TO USE MAGNETOHYDRODYNAMIC (MHD) MODELS FOR MODELING THE INTERACTIONS OF THE SOLAR WIND WITH MAGNETIZED (SUCH AS EARTH) AND UNMAGNETIZED (SUCH AS MARS AND VENUS) PLANETS AND THE INTERACTIONS OF PLANETARY MAGNETOSPHERIC FLOW WITH ITS MOONS (SUCH AS TITAN). WE WILL USE A ONE-WAY COUPLED FRAMEWORK (INCLUDING SOPHISTICATED 3D IONOSPHERE-THERMOSPHERE MODEL 3D EXOSPHERE MODEL AND 3D STELLAR WIND MODEL) CENTERED AROUND A WELL-VALIDATED 3D MULTI-SPECIES MAGNETOHYDRODYNAMIC (MS-MHD) MODEL TO BUILD A MODEL LIBRARY WITH A REASONABLE RANGE OF PARAMETERS. IN THE ONE-WAY COUPLED FRAMEWORK MS-MHD ADOPTS THE NEUTRAL THERMOSPHERIC PROFILES FROM THE GLOBAL IONOSPHERE THERMOSPHERE MODEL (GITM) AND THE EXOSPHERIC PROFILES FROM THE EXOSPHERE MONTE CARLO MODEL ADAPTIVE MESH PARTICLE SIMULATOR (AMPS); THE LATTER CAN BE DIRECTLY APPLIED TO STUDY THE PHOTOCHEMICAL ESCAPE. MS-MHD GITM AND AMPS HAVE BEEN SUCCESSFULLY (ARE BEING) ADAPTED TO E.G. MARS VENUS AND TITAN. FOR THE STELLAR WIND PARAMETERS (SUCH AS THE STELLAR WIND VELOCITY DENSITY TEMPERATURE AND INTERPLANETARY MAGNETIC FIELD) WE WILL ALSO ADOPT THE ALFVEN WAVE SOLAR MODEL (AWSOM) MODEL TO SIMULATE THOSE PARAMETERS (INCLUDING SPACE WEATHER EVENTS SUCH AS CMES/CIRS/SUPER CARRINGTON-TYPE FLARE EVENTS) BASED ON THE OBSERVED MAGNETOGRAMS (OR ZDI MAPS) OF MDWARF STARS. THESE THREE PLANETARY MODELS (THE MHD IONOSPHERE/THERMOSPHERE AND EXOSPHERE MODELS) WILL BE ADAPTED TO EXOPLANET RESEARCH BY MODIFYING THE STELLAR WIND INPUTS AND EXOPLANETARY ATMOSPHERIC PROFILES. RELEVANCE: THE PROPOSAL IS HIGHLY RELEVANT TO THE HABITABLE WORLDS PROGRAM AS THE PROPOSED RESEARCH ON THE STUDY OF ATMOSPHERIC LOSS IS CRUCIAL FOR UNDERSTANDING THE ATMOSPHERIC EVOLUTION CLIMATE CHANGE OF THE EXOPLANETS/EXOMOONS AND THUS OFFERS FRESH INSIGHTS CONCERNING THE HABITABILITY OF EXOPLANETS AND EXOMOONS. THE PROPOSED WORK WILL ENABLE US TO EXPLORE THE POSSIBILITY OF EXTANT LIFE BEYOND THE EARTH BASED ON OUR UNDERSTANDING AND KNOWLEDGE OF ANCIENT AND CURRENT EARTH MARS VENUS TITAN AND THE SOLAR SYSTEM AS A WHOLE. THE "HABITABLE EXOPLANETS AND/OR THEIR MOONS" CONSTITUTE THE CENTRAL TARGETS AND PRIMARY OBJECTIVES OF THE HABITABLE WORLDS PROGRAM. THE PROPOSAL IS ALSO HIGHLY RELEVANT TO NASA'S PLANETARY SCIENCE DIVISION'S CURRENT AND FUTURE MISSIONS (E.G. MAVEN) FOR STUDYING THE MARTIAN ATMOSPHERIC LOSS AND EVOLUTION AS WELL AS NASA'S ASTROPHYSICS DIVISION'S MORE SPECIFICALLY EXOPLANET EXPLORATION PROGRAM'S CURRENT AND FUTURE MISSIONS (E.G. KEPLER AND JWST) FOR THE CHARACTERIZATION OF EXOPLANETS AND THE STUDY OF THEIR HABITABILITY.