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.
The impact crater Hokusai on Mercury has an impressive system of rays emanating as much as a thousand kilometers (more than 600 miles). Image credit: Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington.