Mystery Over 'Giant Spiders' on Mars Surface Finally Explained After 20 Years By Oxford Pauses Trial of AstraZeneca Covid-19 Vaccine in Children and Teenagers Space enthusiasts were spooked out when pictures of Mars' surface showing what looked like creepy black 'giant spiders' were released around 20 years ago. The pictures ignited wild conspiracy theories throughout the years claiming the red planet is filled with worms underneath its soil and also baffled scientists all these years. NASA However, the mystery has finally been unraveled after a team of scientists recreated a smaller version similar to the 'giant spiders' seen on Mars in their lab and reported in their study that the patterns are formed by gas, which is referred to as sublimation, reports