Astro2020 APC White Paper Next Generation LSST Science Type of Activity:  ✓ Ground Based Project  Space Based Project  Infrastructure Activity  Technological Development Activity  State of the Profession Consideration  Other Thematic Areas:  ✓ Planetary Systems  ✓ Star and Planet Formation  ✓ Formation and Evolution of Compact Objects  ✓ Cosmology and Fundamental Physics  ✓ Stars and Stellar Evolution  ✓ Resolved Stellar Populations and their Environments  ✓ Galaxy Evolution  ✓ Multi-Messenger Astronomy and Astrophysics Principal Author: Name: Saurabh W. Jha Institution: Rutgers, the State University of New Jersey Email: saurabh@physics.rutgers.edu Phone: +1 848-445-8962 Co-authors: Federica Bianco, University of Delaware W. Niel Brandt, Pennsylvania State University Gaspar Galaz, Pontificia Universidad Cat´ olica de Chile Eric Gawiser, Rutgers University John Gizis, University of Delaware Ren´ ee Hloˇ zek, University of Toronto Sugata Kaviraj, University of Hertfordshire Jeffrey A. Newman, University of Pittsburgh Aprajita Verma, University of Oxford W. Michael Wood-Vasey, University of Pittsburgh Abstract: The Large Synoptic Survey Telescope (LSST) can advance scientific frontiers beyond its groundbreaking 10-year survey. Here we explore opportunities for extended operations with proposal-based observing strategies, new filters, or transformed instrumentation. We recom- mend the development of a mid-decade community- and science-driven process to define next- generation LSST capabilities. 1 arXiv:1907.08945v1 [astro-ph.IM] 21 Jul 2019