Number 364 (Story #2), March 27, 1998 by Phillip F. Schewe and Ben Stein THE FLATTEST SURFACE IN THE SOLAR SYSTEM is on Mars' northern lowlands. Over a 2000-km-around belt between 50 and 80 degrees north latitude, the surface tilts up only about 0.05 degrees to the south. This data and a number of other results from the Mars Global Surveyor---such as information on the Martian atmosphere, magnetism, plasma fields, topography, and mineralogy---are reported in the 13 March issue of Science.