Conservation Laws and Comets Some statistical properties of comets. ... Akin's Laws of Spacecraft Design . If you'd like to see my design for a Mars orbiter, produced for the Summer-Fall 1999 AIAA Spacecraft Design course, drop me a line, and we'll talk. can check it out here. ... Written for the Fall 2000 Space Systems course at APL, the paper emphasizes methods adapted to solar electric propulsion, however many techniques applicable to high power applications are also outlined. ...