By National Research Council, Division on Engineering and Physical Sciences, Mathematics, and Applications Commission on Physical Sciences, Board on Physics and Astronomy, Space Studies Board, Committee on Astronomy and Astrophysics
Committee on Astronomy and Astrophysics, area reviews Board, Board on Physics and Astronomy, arithmetic, and functions fee on actual Sciences, department on Engineering and actual Sciences, nationwide study Council
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Such measurements would clarify the physics of the explosion, the abundances ejected, and the nature of the remnant. BEHAVIOR OF MATTER UNDER EXTREME CONDITIONS Some of the most challenging problems in astrophysics concern the behavior of systems under extreme conditions. Compact stars are among the most important and interesting in this regard. Because of the large gravity they generate, the natural form of radiation is in the x- or gamma-ray bands. Study of these bands is done uniquely or most efficiently from space.
2 One manifestation of complex interactions between mass lost from stars in different stages of their evolution is clearly visible in this HST image of cometary knots in the Helix nebula, the planetary nebula closest to Earth. The head of each gaseous knot is approximately twice the size of the solar system, and the knots' long tails form a radial pattern around the star like spokes on a wheel. They are probably formed during the final years of a star's life when it ejects shells of gas into space.
Future Directions for Understanding Stellar Evolution Future progress in the study of stellar evolution can be achieved in a number of different ways. These are, in approximately the order encountered in stellar evolution, the following: 1. Studying nonspherical effects in young stars and protostellar disks. Young binary stars serve as laboratories to help researchers understand the influence of massive companions on protostellar disks. Similarly, mass functions of young stars, both single and binary, are still very uncertain.
A New Science Strategy for Space Astronomy and Astrophysics by National Research Council, Division on Engineering and Physical Sciences, Mathematics, and Applications Commission on Physical Sciences, Board on Physics and Astronomy, Space Studies Board, Committee on Astronomy and Astrophysics