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Science 13 March 1998:
Vol. 279. no. 5357, p. 1634
DOI: 10.1126/science.279.5357.1634
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Research News

PLANETARY SCIENCE:
Surveyor Shows the Flat Face of Mars

Richard A. Kerr

Mars has a great crustal dichotomy: Much of its northern hemisphere is a low-lying plain roughly centered on the north pole, while the rest of that hemisphere and all of the southern hemisphere are ancient highlands. The first results from the altimeter aboard the Mars Global Surveyor spacecraft, reported on page 1686, are now indicating that Earth-like tectonic forces and perhaps even an ancient ocean have shaped Mars's northern lowlands.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)