Why is Mars Covered in 'Spiders'?

Why does Mars appear to have Spiders and spiderwebs on the surface?

Mars Express spots a fractured maze near the south pole called Inca City, and nearby hundreds of dark spider shapes appear and vanish with the seasons; watch the mystery unfold through dust plumes, hidden CO₂ explosions, and a lab experiment that recreates Martian geysers, then picture standing on the red planet while the ground around you cracks and hisses each spring.
#universe, #perfect universe, #galaxy