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Our working group had the task to discuss the present status and future prospects of nuclear and particle astrophysics, a field which addresses quite diverse question like e.g. the big bang, stellar evolution, supernovae, neutron stars or cosmic rays (see also ). Section 3 outlined the open problems and future needs and means for their exploration. Many of these benefit directly or indirectly from the overall recommendations accepted by NuPECC in April 1997, e.g. (i) the need to preserve and maintain low energy/high intensity stable beam accelerators with novel gamma and particle detection systems, (ii) the support for existing and need for next generation (low and high energy) radioactive beam facilities to provide reaction cross sections of unstable nuclei and explore nuclear structure far from stability towards the neutron and proton drip-lines, (iii) to support an expansion of the pilot underground (background-free) accelerator facility at Gran Sasso for the direct measurement of cross sections at stellar thermal energies much below the Coulomb barrier, (iv) to support present and next generation solar neutrino detectors, (v) continued R&D in cryogenic detectors for double beta-decay and dark matter searches, (vi) relativistic heavy ion collisions which might improve our understanding of the supra-nuclear equation of state, (vii) the need for positions in theory to push ahead the complex questions behind these experimental investigations and (vii) finally the need for powerful computing facilities to address the complex many-body problems and large scale hydrodynamical modelling. It is our hope that other communities (particle/high energy physics, astronomy, space research) give support for the equally important topics outlined in the sections on CMB anisotropies, the baryon asymmetry of the universe, high energy cosmic ray, gamma ray and large volume neutrino detectors, gamma-ray satellites, and observational tools to determine the composition of stars, the interstellar and intergalactic medium. We want to thank many colleagues for advice and discussions, in particular all participants of the Brussels meeting between Astrophysicists and Nuclear Physicists, its organisers M. Arnould and C. Leclercq-Willain, and J. Bahcall, P. Biermann, M. Cassé, R. Diehl, P. Fleury, H. Fontaine, F. Käppeler, E. Kolbe, K.-L. Kratz, K. Langanke, H. Rebel, C. Riisager, G. Schatz, F. Weber, M. Weigel and B. Wiebel-Sooth for contributions or careful reading of the manuscript.