Last Updated: Mysterious Clusters Of Dark Streaks On Mars Is Probably Because Of Landslides Researchers have found what could clusters of dark streaks on Mars probably be because of. Here is more information about it, read on to know. Researchers have been reasoning what could be the cause of the dark streaks on some Martian slopes, which are also known as recurring slope lineae. While some researchers think temporary surface flows of salty water are responsible, others think that landslides are a more likely explanation. Here is more information about what a new study has found about the mysterious dark streaks on Mars.