Section headings and selected papers: Astrometry From Space. Foreword. Scientific requirements for very accurate astrometry, J Kovalevsky & C Turon. ;B>HIPPARCOS. HIPPARCOS: revised mission overview, M A C Perryman. HIPPARCOS: first results of the photometric processing, F Mignard et al . Expected performances of HIPPARCOS satellite in detecting double star systems, M Badiali et al . Hubble Space Telescope. Astrometry using the Hubble Space Telescope fine guidance sensors, R L Duncombe et al . Expanding the scientific role of the Hubble Space Telescope fine guidance sensors, L G Taff. Accurate Ground-Based Astrometry. Double star CCD astrometry and photometry, P Lampens et al . Future Projects. Review of projects in space astronomy, J A Hughes. Astrometric projects in USSR, C A Avanesov et al . The Infrared and Submillimeter Universe at High Redshifts. Preface. Early results from the Cosmic Background Explorer (COBE), J C Mather et al . First results of the COBE satellite measurement of the anisotropy of the cosmic microwave background radiation, G Smoot et al . Components of the infrared celestial emission, D J M Kester & P R Wesse;ius. The capabilities of ISOPHOT to detect the infrared extragalactic background radiation, D Lemke et al . Properties of the galaxies giving rise io Mg II Quasar absorption systems, J Bergeron and P Boisse. Infrared capabilities of very large groundbased telescopes, A F M Moorwood. Space VLBI. Preface. Space VLBI and the physics of active galactic nuclei, E Valtaoja. Introduction to the VSOP mission and its scientific goals, H Hirabayashi. Astrometry and proper motions with space VLBI,