How extensive is NASA's current space exploration program and what is the relationship between science and exploration?

NASA currently operates 140 active missions across the solar system, demonstrating the unprecedented scope of human space exploration. The relationship between science and exploration is symbiotic - scientific knowledge enables more ambitious exploration missions, while exploration activities generate new scientific discoveries and data. This interconnected approach allows NASA to continuously push the boundaries of human knowledge while advancing our capabilities to explore deeper into space, ultimately benefiting humanity through technological innovations and scientific breakthroughs.