Rosetta

Rosetta achieved a historic first by orbiting Comet 67P/Churyumov-Gerasimenko in 2014 and landing the Philae probe on its surface, unlocking direct data on the solar system's primitive building blocks. The mission analyzed over 100,000 cometary particles, detecting organic molecules like glycine, an amino acid fundamental to life. This accomplishment outperforms #2 Stardust, which only collected dust during a temporary flyby from a comet's tail. Rosetta's 10-year, 4-billion-mile journey orbited the comet for two years, tracking its evolution around the Sun—an endurance feat 30% longer than the typical comet mission's observation window. Its data showed comets delivered Earth's water in a ratio matching our oceans with 3% isotopic precision, challenging earlier theories about water origins.