Nature are now publishing an on-line publication devoted to Astronomy. The good news is that it is free for the first year. It will be interesting to see how it develops and what the subscription price is (for those who do not have access via Uni accounts).
Take a look at http://www.nature.com/natastron/
I am not sure if this is intended to replace or supplement the publication of papers on Astronomy in Nature itself.
One of the articles is a review on the ‘Three eras of planetary exploration’ that seems a useful summary of what has been found so far
Enjoy.
John Murrell