Mysterious Martian Gullies: Unraveling the Red Planet's Watery Past

Gullies on Mars may have formed when the planet was highly tilted on its side, causing shifts in climate that allowed water to flow down slopes and carve out ravines. Previous theories suggested carbon dioxide frost or past favorable climates as potential sources, but a new study suggests that a combination of melting ice, sublimating carbon dioxide, and high obliquity can explain the pattern of gullies seen on Mars. These findings have implications for the potential existence of life on Mars, as water is a key ingredient for life as we know it.