rootbrowseIAC-17symposium D4D4. 15th IAA SYMPOSIUM ON VISIONS AND STRATEGIES FOR THE FUTURESessions1. Innovative Concepts and Technologies2. Contribution of Space Activities to Solving Global Societal Issues3. Conceptualizing Space Elevators and Tethered Satellites4. Strategies for Rapid Implementation of Interstellar Missions: Precursors and Beyond5. Space Mineral Resources, Asteroid Mining and Lunar/Mars insitu