NIAC PHASE II SEEKS PROPOSALS THAT WILL CONTINUE THE EXPLORATION AND DEVELOPMENT OF REVOLUTIONARY ADVANCED CONCEPTS STARTED THROUGH A NIAC PHASE I AWARD. WHILE THE PHASE I STUDY ESTABLISHES BASIC FEASIBILITY AND CLEAR POTENTIAL BENEFIT, THE PHASE II STUDY EXTENDS, REFINES, AND BUILDS UPON THIS FOUNDATION. PHASE II STUDIES ADDRESS KEY REMAINING UNKNOWNS, ASSUMPTIONS, RISKS, AND PATHS FORWARD. THIS SHOULD EXPLICITLY INCLUDE COST, PERFORMANCE VS. ALTERNATIVES, DEVELOPMENT STEPS AND ASSOCIATED SCHEDULE, AND KEY ENABLING TECHNOLOGIES. THESE RESULTS AIM TO PROVIDE A SOUND BASIS FOR NASA TO CONSIDER THE CONCEPT FOR FURTHER DEVELOPMENT AND A FUTURE MISSION, SUBSTANTIATED WITH A DESCRIPTION OF APPLICABLE SCIENTIFIC AND TECHNICAL DISCIPLINES NECESSARY FOR DEVELOPMENT.