12 January 1996
Vol 271, Issue 5246

About The Cover

The shape of Mars relative to an ellipsoid: reds are highs and greens are lows. The red line indicates the geologic boundary between the distinctive northern and southern hemispheres and is solid where a scarp has been mapped. The differences in ellipsoidal heights (that is, the highs and lows) do not correlate with the geologic boundary. See 184. [Image: G. A. Neumann and M. T. Zuber]