Bright and Dark Slope Streaks by BeautifulMars (HiRISE/NASA) published on 2021-09-21T17:47:47Z Slope streaks are common in the tropics of Mars. Once thought to be caused by flowing water, most scientists now believe that they are avalanches of dust. Narration: Tre Gibbs https://uahirise.org/ESP_059261_1950 Genre Science