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This paper is based on the 100 most cited papers in astronomy for each yearfrom 2000 to 2009 and from 1995 and 1990. The main findings are: The totalnumber of authors of the top 100 articles per year has more than tripled. Thisis seen most strongly in papers with more than 6 authors. The yearly number ofpapers with 5 or fewer authors has declined over the same time period. The mosthighly cited papers tend to have the largest number of authors and visa versa.The distribution of normalized citation counts versus ranking is constant fromyear to year except for the top ranked half dozen or so papers. It is closelyapproximated by a power law. The papers that show the most divergence from thepower law all have a high number of citations and are based on large surveys.The average page length of the top 100 papers is one and a half times that forastronomy papers in general. The same 5 journals (A&A, AJ, ApJ, ApJS, andMNRAS) account for 80 to 85% of the total citations for each year of all thejournals in the category "Astronomy and Astrophysics" by ISI's Journal CitationReports. These same 5 journals account for 77% of the 1000 most cited papers. Asignificant number of articles originally ranked in the top 100 for a year,drop out after 2 to 3 years and are replaced by other articles. Most of thedrop-outs deal with extra-galactic astronomy; their replacements deal withnon-extra-galactic topics. Indicators of internet access to astronomical websites such as data archives and journal repositories show increases of betweenfactors of three and ten or more I propose that there are closecomplementarities between the communication capabilities that internet usageenables and the strong growth in numbers of authors of the most highly citedpapers.

Astronomy's Greatest Hits: The 100 most Cited Papers in Each Year of the First Decade of the 21st Century (2000 - 2009)