Mars’s surface is covered in interesting features that indicate the planet’s past and the water that once survived on its surface. Some researchers have proposed that these features were formed by mud volcanoes, but these theories have been difficult to evaluate. Now, in an experiment, researchers sent mud flowing down a sandy slope in a laboratory room that simulated Mars situations. They observed that under the low atmospheric pressure of Mars, the mudflows behave in much the same way as ‘pāhoehoe,’ or ‘ropy,’ lava, which is familiar from large volcanoes on Hawaii and Iceland. Researchers think that this kind of mud volcanism could be existing in other places throughout our solar system such as dwarf planet Ceres.