Recently, Bart was studying the lunar landscape in high-resolution images taken in 1969, prior to the Apollo landings, for her research on processes that modify the lunar surface.
"Totally by accident, I saw gullies that looked strikingly like the gullies on Mars," she said.
"If the dry landslide hypothesis for the formation of martian gullies is correct, we might expect to see similar features on the moon, where there is no water," she said. "We do."
"My point is that you can't just look at the Mars gullies and assume they were formed by water. It may be, or may be not. We need another test to know."