Curiosity

A car-sized, nuclear-powered mobile laboratory on Mars. Curiosity represented a massive leap in rover capability — at 2,000 pounds, it was five times heavier than Spirit or Opportunity and carried ten times the scientific instrumentation, including a laser that can vaporize rock from 23 feet away. Powered by a radioisotope thermoelectric generator (not solar panels), it operates day and night, in any season. Curiosity proved that Mars once had conditions suitable for microbial life. Still operating after 12+ years, it demonstrates what's possible when you invest in a robust, modular platform rather than optimizing for minimum viable product.