522 accretion(astrophysics) astronomy astrophysics astrophysicsandcosmology atlases charts congresses cosmicbackgroundradiation cosmology dataprocessing diagrams disks(astrophysics) doublestars etc evolution extraterrestrialphysics formation galaxies globularclusters grape(computerfile) gravitation gravitationallenses largescalestructure(astronomy) multiplestars nebulae observers'manuals physics qb857 relativity(physics) relativityandcosmology science(general) spacesciences stars statisticalastronomy supercomputers x-rayastronomy