Infant Cosmos Was Already Elderly 07/08/2004
At first, they weren’t sure it was real or they were just seeing things. Now, it’s inescapable. As far back as cosmologists can see, there were already mature galaxies. That’s the thrust of two papers in the July 8 issue of Nature1,2 and a commentary on them by Keck Observatory astronomer Greg Wirth3, who says in the subtitle, “The discovery of massive, evolved galaxies at much greater distances than expected – and hence at earlier times in the history of the Universe – is a challenge to our understanding of how galaxies form.”
1 Karl Glazebrook et al., “A high abundance of massive galaxies 3-6 billion years after the Big Bang,” Nature 430, 181 - 184 (08 July 2004); doi:10.1038/nature02667.
2A. Cimatti et al., “Old galaxies in the young universe,” Nature 430, 184 - 187 (08 July 2004); doi:10.1038/nature02668.
3Gregory D. Wirth, “Old before their time,” Nature 430, 149 - 150 (08 July 2004); doi:10.1038/430149a.