The Infrared Space Observatory (ISO) photometer is one of four instruments on-board the European Space Agency ISO scheduled for launch in September 1995. It covers the wavelength range 2.5 to 240 micrometers with wide and narrow spectral bands. Diffraction- limited observations as well as wide-beam measurements of faint extended sources are

Temperature fluctuations in the cosmic microwave background are a key prediction of cosmological models of structure formation in the early Universe. Ground-based multi-frequency radio observations of the microwave background reveal well defined features that are not of atmospheric or Galactic origin; instead, they delineate the primordial density

We have obtained surface photometry in U, B, R, and I for a complete optically selected sample of 45 early-type spiral galaxies, to investigate the colors and color gradients of spiral bulges. Color profiles in U-R, B-R, U-B, and R-I have been determined in wedges opening on the semiminor axes. Based on several criteria, like the smoothness of the

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