Scientists have discovered that certain bacteria that cause illness in humans have the potential to survive on Mars. This finding raises concerns about the potential for microbial contamination on future Mars missions and the possibility of human colonization. The study suggests that these bacteria, known as opportunistic pathogens, can withstand the harsh conditions of the Martian environment, including low temperatures and high radiation levels. Understanding the survival capabilities of these microbes is crucial for planning and executing safe and sterile missions to the Red Planet.