The history of the galaxies.
Astronomical observations now reach far enough back in time, in enough depth and detail, to reveal the history of galaxies since their formation. The early Universe contained a network of gas clouds that filled much of the space between the young galaxies, where stars were forming at a high rate. Since then, intergalactic space has been swept clean, and galaxies have continued to convert the dwindling supply of gas slow into stars.
Fukugita
M
M
Institute for Advanced Study, Princeton, New Jersey 08540, USA.
Hogan
C J
CJ
Peebles
P J
PJ
D055580:Astronomical Phenomena; D001256:Astronomy; D004601:Elementary Particles; D005118:Extraterrestrial Environment; D005740:Gases / Q000032:analysis; D006859:Hydrogen / Q000032:analysis; D013057:Spectrum Analysis
D005740:Gases; D006859:Hydrogen