Shireen Gonzaga is a freelance writer who enjoys writing about natural history. She is also a technical editor at an astronomical observatory where she works on documentation for astronomers. Shireen has many interests and hobbies related to the natural world. She lives in Cockeysville, Maryland.
An image showing scarps (cliffs), features associated with tectonic activity, on the surface of Mercury taken by MESSENGER during a fly-by on Jan. 14th, 2008. Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington.