In DepthPlanetary Science

A wet blanket for theories of liquid water on Mars

See allHide authors and affiliations

Science  01 Dec 2017:
Vol. 358, Issue 6367, pp. 1119
DOI: 10.1126/science.358.6367.1119

You are currently viewing the summary.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution

Summary

In 2011, researchers discovered recurring slope lineae, thousands of streaks along steep slopes, mostly near the equator, that gradually grow and darken as spring turns to summer, as if fed by seeps of water, before fading. One of the discoverers, Alfred McEwen, a planetary geologist at the University of Arizona in Tucson, was never so sure that liquid flowing water was responsible. Now, McEwen and his colleagues have shown that the hillside markings might be better explained by dry flows of sand and dust seeking their natural angle of repose. Science recently caught up with McEwen for an interview.