COSMOLOGY:
Cosmic Web Captures Lost Matter
James Glanz
SAN DIEGO--Vast hydrogen clouds filled the early universe but have since vanished, leaving the matter they contained unaccounted for. But in a talk at an American Astronomical Society meeting here earlier this month, a cosmologist predicted that observers will soon find most of the ordinary matter in the universe right under their noses. Computer simulations show that the primordial clouds condensed over time into a vast, filamentary network of ionized gas--a cosmic cobweb that now links galaxies and galaxy clusters.