  The past three decades have seen prodigious advances in astronomy and
astrophysics. Beginning with the exploration of our solar system and continuing
through the pioneering Explorers and Great Observatories of today, NASA
missions have made essential contributions to these advances. This roadmap
presents a science-driven 30-year vision for the future of NASA Astrophysics
that builds on these achievements to address some of our most ancient and
fundamental questions: Are we alone? How did we get here? How does the universe
work? The search for the answers constitutes the Enduring Quests of this
roadmap. Building on the priorities identified in New Worlds, New Horizons, we
envision future science investigations laid out in three Eras, with each
representing roughly ten years of mission development in a given field. The
immediate Near-Term Era covers ongoing NASA-led activities and planned
missions. This will be followed by the missions of the Formative Era, which
will build on the preceding technological developments and scientific
discoveries, with remarkable capabilities that will enable breakthroughs across
the landscape of astrophysics. These will then lay the foundations for the
Daring Visions of the Visionary Era: missions and explorations that will take
us deep into unchartered scientific and technological terrain. The roadmap
outlined herein will require the vision and wherewithal to undertake highly
ambitious programs over the next 30 years. The discoveries that emerge will
inspire generations of citizen scientists young and old, and inspire all of
humanity for decades to come.
