Ranked by years of continuous operation. Voyager 2 leads at 48+ years and counting. Here's the full top 10 — including the rovers, orbiters, and probes that wildly outlived their warranty.
Ranked by inflation-adjusted total program cost in 2025 USD. Apollo leads at ~$280B, Space Shuttle is second, ISS third. Here's the full top 10 — and what's program vs. mission cost.
Are Saturn's rings 100 million or 4.5 billion years old? Cassini's 13 years of data, Enceladus plumes, Titan's methane lakes, and the biggest Saturn mysteries still open.
Cassini-Huygens: 20 years, 293 Saturn orbits, Titan's methane lakes, Enceladus's ocean plumes, and the 2017 Grand Finale plunge that redefined planetary science.
Cassini found geysers, hydrothermal vents, and phosphorus erupting from Enceladus — a 504-km moon with a global ocean that may be our best shot at alien
