"M71"--spine.

Includes bibliographical references.

Dark matter / B. Sadoulet -- The X-ray background / G. de Zotti ... [et al.] -- New extragalactic results from Sigma / J. Ballet ... [et al.] -- Early ROSAT results on X-ray sources and background / M. Schmidt ... [et al.] -- Active and inactive galactic nuclei, X-ray and gamma-ray background, and the intergalactic medium / S. Collin-Souffrin -- The [gamma]-ray line signature of the elusive neutrino / P. Salati ... [et al.] -- Remote clusters and X-ray backgrouund / R. Schaeffer -- Properties of X-ray clusters / A. Blanchard ... [et al.] -- Evidence for extragalactic components in the diffuse far ultraviolet background / S. Bowyer -- The diffuse ultraviolet background and the intergalactic medium / P. Jakobsen.

The cosmological UV background from decaying neutrinos / D.W. Sciama -- The extragalactic background light : optical and near-infrared observations / K. Mattila ... [et al.] -- Observations of the infrared extragalactic background light with Isophot / Ch. Leinert ... [et al.] -- Redshift constraints and clustering of faint galaxies / P. Guhathakurta -- Visible and near-infrared galaxy counts and the implications for the cosmological geometry / J.P. Gardner -- Galaxy counts at ultraviolet wavelengths (2000 A) / B. Millard ... [et al.] -- Faint galaxy counts and globular clusters in Fornax ellipticals / R. Madejsky ... [et al.] -- Models of faint galaxy counts / B. Guiderdoni -- Mergers in a CDM cosmology / R.G. Carlberg.

The diffuse background at far-IR wavelengths / M.G. Jones ... [et al.] -- Cosmic background explorer (COBE) observations : new sky maps of the early universe / G.F. Smoot -- Modelling the extragalactic IR background light / A. Farnceschini ... [et al.] -- COBE and the post-recombination ERA / B.J. Carr ... [et al.] -- The rotational excitation temperature of CN / Ph. Crane ... [et al.] -- The spectrum distortion of relic radiation in the moment of universe recombination / V.V. Burdyuzha ... [et al.] -- Galaxy evolution models and the extragalactic background light / B. Rocca-Volmerange -- Some comments on galaxy formation / S.D.M. White -- Star formation driven by galaxy interactions : a model for the evolution of the galaxy luminosity function and number counts / C.G. Lacey.

Galaxy counts and correlation functions on large-scales / S. Maddox -- Is standard CDM compatible with all available data? / M. Davis -- Dark matter and light distribution / F. Bernardeau -- Great attractor modelling and galaxy formation / V.N. Lukash -- Nonlinear comparison of large-scale densities and velocities / A. Yahil -- The diffuse sky emission at X and gamma ray energies and the future space missions / G.F. Bignami -- Future observations of the far ultraviolet background / J.M. Deharveng -- High spectral resolution surveys of the X-ray background / W.T. Sanders ... [et al.] -- The diffuse extreme ultraviolet background / S. Bowyer ... [et al.] -- Submillimeter projects / F. Pajot.

The Italian OASI obervatory / G. Dall' Oglio ... [et al.] -- Search for macroscopic dark matter in the galactic halo through microlensing / E. Aubourg.