Martian spiders aren't actually spiders like the ones we have on Earth. They are landforms on the surface of Mars that look like spiders when viewed from above. These formations are made up of deep channels that branch out from a central point like the legs of a spider. The channels are created when carbon dioxide gas trapped beneath the surface of Mars gets released as the temperature changes, causing the surface material to collapse and form the spider-like shapes. It's like when we blow bubbles in our drink and the bubbles make channels in the ice cubes. These martian spiders are really cool to look at and study, but they don't crawl around or spin webs like the spiders we have on Earth.