Piles of crater-topped debris snapped by NASA’s Mars orbiter and caused by the teakettle explosion of water through volcanic lava flows at the planet’s equator are the best evidence yet for recent liquid water at the Red Planet, a team of scientists say. Under a model devised by the University of Arizona and University of Hawaii researchers, the “rootless cones” formed after volcanic eruptions melted frozen water near the surface of Mars 10 million years ago — practically present time in the geological view. The melting caused floods that carved channels and seeped into the ground.