{
  "title": "Which planet wins the moon race? · 1900–2025",
  "retrieved": "2026-10-18",
  "primarySource": "https://ssd.jpl.nasa.gov/sats/discovery.html",
  "method": "JPL Solar System Dynamics · current satellite discovery catalogue, retrieved 18 Oct 2026. Retrospective reconstruction: each currently catalogued moon is counted once at its earliest listed discovery year. Not a history of confirmations or what was officially known at each date. The 1900 baseline includes earlier discoveries: Jupiter 5, Saturn 9, Uranus 4, Neptune 1. In 2025: 115, 293, 29, 16 respectively. Four selected giant planets, 504 observations (126 years × 4). Counts are already cumulative; native cumulative mode stays off. No missing values filled with zero; animation between annual points is visual interpolation. Images: Jupiter and Neptune NASA/JPL; Saturn NASA/JPL/USGS; Uranus NASA/JPL-Caltech. No NASA/JPL endorsement. Discovery references, image credits and reuse policy in source notes.",
  "imageSources": {
    "source_api": "https://images-api.nasa.gov/search",
    "items": [
      {
        "planet": "Jupiter",
        "nasa_id": "PIA01324",
        "title": "Jupiter",
        "credit": "NASA/JPL",
        "center": "JPL",
        "description": "This crescent view of Jupiter was taken by NASA Voyager 1 on Mar. 24, 1979.",
        "detail_url": "https://photojournal.jpl.nasa.gov/catalog/PIA01324",
        "image_url": "https://images-assets.nasa.gov/image/PIA01324/PIA01324~orig.jpg",
        "http_status": 200,
        "mime_type": "image/jpeg"
      },
      {
        "planet": "Saturn",
        "nasa_id": "PIA00335",
        "title": "Full-disk Color Image of Crescent Saturn with Rings and Ring Shadows",
        "credit": "NASA/JPL/USGS",
        "center": "JPL",
        "description": "Full-disk Color Image of Crescent Saturn with Rings and Ring Shadows  http://photojournal.jpl.nasa.gov/catalog/PIA00335",
        "detail_url": "https://photojournal.jpl.nasa.gov/catalog/PIA00335",
        "image_url": "https://images-assets.nasa.gov/image/PIA00335/PIA00335~orig.jpg",
        "http_status": 200,
        "mime_type": "image/jpeg"
      },
      {
        "planet": "Uranus",
        "nasa_id": "PIA18182",
        "title": "Uranus as seen by NASA Voyager 2",
        "credit": "NASA/JPL-Caltech",
        "center": "JPL",
        "description": "This is an image of the planet Uranus taken by the spacecraft Voyager 2 in 1986.",
        "detail_url": "https://photojournal.jpl.nasa.gov/catalog/PIA18182",
        "image_url": "https://images-assets.nasa.gov/image/PIA18182/PIA18182~orig.jpg",
        "http_status": 200,
        "mime_type": "image/jpeg"
      },
      {
        "planet": "Neptune",
        "nasa_id": "PIA01492",
        "title": "PIA01492",
        "credit": "NASA/JPL",
        "center": "JPL",
        "description": "This picture of Neptune was produced from the last whole planet images taken through the green and orange filters on NASA's Voyager 2 narrow angle camera. The images were taken at a range of 4.4 million miles from the planet, 4 days and 20 hours before closest approach. The picture shows the Great Dark Spot and its companion bright smudge; on the west limb the fast moving bright feature called Scooter and the little dark spot are visible. These clouds were seen to persist for as long as Voyager's cameras could resolve them. North of these, a bright cloud band similar to the south polar streak may be seen. http://photojournal.jpl.nasa.gov/catalog/PIA01492",
        "detail_url": "https://photojournal.jpl.nasa.gov/catalog/PIA01492",
        "image_url": "https://images-assets.nasa.gov/image/PIA01492/PIA01492~orig.jpg",
        "http_status": 200,
        "mime_type": "image/jpeg"
      }
    ]
  },
  "imageUsePolicy": "https://www.jpl.nasa.gov/jpl-image-use-policy/",
  "columns": [
    "Year",
    "Planet",
    "Moons",
    "Image"
  ],
  "observations": 504,
  "baseline1900": {
    "Jupiter": 5,
    "Saturn": 9,
    "Uranus": 4,
    "Neptune": 1
  },
  "totals2025": {
    "Jupiter": 115,
    "Saturn": 293,
    "Uranus": 29,
    "Neptune": 16
  },
  "nativeCumulative": false
}