National Geographic 2003. (nem teljes évfolyam) [antikvár]

The backyard sky never looked lilie this: .Some ' 200,000 galaxies whirl through space • ' . i • computer-generated model using data from the $loan Digital Sky Survey, an ambitious effort to * -map one-quarter of the cosmos. Based on images fr^m the Apache Point Observatory in New iVIexico, model marks the locations ofypearby galaxies . ^h^'representative picture^ greatly magnified. ^ ' Beyond |ie 100 bJHion mor^|p;alaxies, each with ^ many bíHftns of stars. Where did all the material ~ come^om that coalesced into galaxies? Aided by powerful telescopes and (computers, scientists aie comlrig ever closer to answers. 'm- V y Ro" Co wen piverse with no stafc, no galaxies, _ i_i - _i_ 1________1 ] and no light: just a black brew of * primordial gases immersed in a sea - of invisible matler. Beginning a few hundred thoidSand years ailei» the blinding flash of the big bang, the universe plunged into a darkness that lasted alnlq^t a half billion years. Then something happened that changed it all, somethi^i^jdi^led to the creation not just of stars alo^d ^Ifixies, but also of a^ets, people, begonias, and lizards. iWhat ci^ld that safoiething have been? New elites to this pitzzie^one of the m^ii^ fundamental in cosmology—are pouring in ffom many directions, 'i^he-brists^iM supercomputer simulations haVe rkrabed ttie steps that^oduced th^^ l^^st stafs and galaxies. Astronomers peer-^^ through gi^t new telescopes have jour.nfeyed^fea^jm time in search of the RALF KAHLE^ZUSE IN^TgUTE BERLIN (ZIBl/MAX PLANCK INSTITUTE IMP!) FOR QRAVITATIONAL ' O. ' \ AND TOM ABEL PENNSYLVANIA STATE UNIVERSITY IPSU)