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 reports Board, Board on Physics and Astronomy, arithmetic, and purposes fee on actual Sciences, department on Engineering and actual Sciences, nationwide study Council
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Extra resources for A New Science Strategy for Space Astronomy and Astrophysics
Answering these questions presents a major technological challenge owing to the enormous range of scales involved—from the size of galaxies to the size of planets—and the range of wavelengths over which observations must be made, from x rays for the hot gas in galactic disks to millimeter and submillimeter radiation for the cold gas and dust in protostellar disks. The greatest gap in current knowledge is at the smallest scales, and motivates the long-term goals of developing systems that can obtain spectra of terrestrial planets around nearby stars and image protoplanetary disks in nearby star-forming regions.
Large and Small Magellanic Cloud and M31) and measurement of their time-dependent, multiwavelength spectra. This task requires largecollecting-area, x- and gamma-ray imaging and spectroscopy. To determine whether the "annihilation" line in some black hole transients is due to positrons or to a blend of spallation gamma rays requires high-resolution, time-dependent, hard x-ray and MeV spectroscopy. ORIGIN OF THE ELEMENTS Elements heavier than lithium are produced in stars by complex processes, and quantitative understanding of the chemical enrichment of the Milky Way and external galaxies is still rather primitive.
Astronomers still do not know if Type Ia supernovae arise in a binary system containing a white dwarf and a About this PDF file: This new digital representation of the original work has been recomposed from XML files created from the original paper book, not from the original typesetting files. Page breaks are true to the original; line lengths, word breaks, heading styles, and other typesetting-specific formatting, however, cannot be retained, and some typographic errors may have been accidentally inserted.
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