Twin probes to circle moon to study gravity field - The Associated Press http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNHupAWfDR1k_olHG_uh-O9Z1tLG3Q&url=http://www.google.com/hostednews/ap/article/ALeqM5gNgUVUOK5tKq6bW0bu7zO_rBClzw?docId%3D9d81f64502bc461db8b5ee4f38af347f
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