One of the most interesting questions in astronomy today is how have galaxies changed since the beginning of the universe? The current thinking - based on lots of observational evidence - is that at early times galaxies were forming many more stars then they are now, and that the large clusters of galaxies we see in the nearby universe formed rather recently. However, recent analysis of a Spitzer observation of a galaxy cluster when the universe was much younger than it is today found that the properties of its galaxies are very similar to those of nearby galaxt clusters. Very, very, interesting. Go here to read more.
Saturday, July 10, 2010
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