http://digfir-published.macmillanusa.com/astronomy_imagemaps/astronomy_imagemaps_a001.html
Chapter
5. Detecting Exoplanets
57276914757a2e8076000003
http://digfir-published.macmillanusa.com/astronomy_imagemaps/astronomy_imagemaps_a001_dlap.xmlDLAP questions57276914757a2e8076000003