Number 17 (Story #1), January 17, 1991 by Phillip F. Schewe and Ben Stein ROSAT, THE GERMAN X-RAY SATELLITE , has taken pictures of the sky farther out in distance, or equivalently further back in time, than any other x-ray images previously recorded. These pictures reveal a great density---with a suggestion of clustering---of quasars at redshifts between one and two. Such a clustering seems to be further bad news for the cold-dark-matter version of the big bang model which cannot easily account for such large structure so early in the history of the universe. Guenther Hasinger of the Max Planck Institute near Munich, one of the leaders of the Rosat project, said at a meeting of the American Astronomical Society in Philadelphia that Rosat (Roentgen Satellite) can see x-ray sources up to 2.5 times fainter than the Einstein x-ray satellite (which no longer operates) and that Rosat has been able to resolve up to 40% of the heretofore diffuse x-ray background into point sources. Launched last June, Rosat has spent much of its observing time doing an all-sky survey at x-ray wavelengths, but the satellite also carries a telescope for observing the sky at extreme-ultraviolet wavelengths, permitting a first-ever survey in that range. (U.S contact for Rosat: Steve Holt, NASA Goddard.)