Use Oxford Reference Online to find background information on your topic. The database contains electronic versions of top-quality reference titles in an easy-to-use interface.
Encyclopedias and dictionaries are a great way to start your research. They offer a basic overview of your topic and can lead you to more specific topic. Don't forget to look at the bibliography that accompanies most articles as there may be good articles that you can use in your research.
Dictionary of Geophysics, Astrophysics and Astronomy by 
Encyclopedia of the Solar System by 
The Firefly Encyclopedia of Astronomy by 
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