Abstract
Planetary Topography![Figure][1] An ancient river erodes the landscape in Namibia. PHOTO: ERIC NATHAN/ALAMY STOCK PHOTO Earth, Mars, and Titan have all hosted rivers at some point in their histories. Rivers erode the landscape, leaving behind signatures that depend on whether the surface topography was in place before, during, or after the period of liquid flow. Black et al. developed two metrics to measure how well river channels align with the surrounding large-scale topography (see the Perspective by Burr). Earth's plate tectonics introduce features such as mountain ranges that cause rivers to divert, processes that clearly differ from those found on Mars and Titan. Science , this issue p. [727][2]; see also p. [708][3] [1]: pending:yes [2]: /lookup/doi/10.1126/science.aag0171 [3]: /lookup/doi/10.1126/science.aan2719
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