Evidence of alien life on Mars may have already been found by Nasa’s rover but scientists failed to notice, a new study suggests

In 2007, the Spirit rover photographed intriguing finger-like rock formations at the Home Plate plateau, a 300 square foot area in the Gusev crater near the Martian equator.

Scientists from the University of Arizona decided to look for similar features on Earth to determine how they were formed, and found nearly identical structures at El Tatio, Chile, which were created by a combination of hot springs and crucially, micro-organisms.