Size It Up

ALL ANSWERS · SPACE · DAILY No. 9 · SEPTEMBER 12, 2026

Size It Up Space answer: September 12

The five Space silhouettes for September 12, with the true sizes. If you have not played yet, this page is a spoiler — play these five first, then come back to argue with the numbers.

Day 9 ran from Enceladus (504.2 km) to Jupiter (139,800 km). The widest gap was round 4, Tethys against Titan, at 4.8×; the closest call was round 1, Umbriel against Ariel, only 1.0× apart — the kind of round that separates a 90 from a 60.

  1. ROUND 1

    Umbriel (Uranus’s moon · mean diameter) vs Ariel (Uranus’s moon · mean diameter)

    Ariel · reference · 1,158 km
    Umbriel · true diameter · 1,169 km

    1.0× wider than Ariel

    Umbriel, a moon of Uranus, has a mean diameter of about 1,169.4 km. This is the body’s size, not an orbital distance.

  2. ROUND 2

    Enceladus (Saturn’s moon · mean diameter) vs Oberon (Uranus’s moon · mean diameter)

    Oberon · reference · 1,523 km
    Enceladus · true diameter · 504.2 km

    3.0× shorter than Oberon

    Enceladus, a moon of Saturn, has a mean diameter of about 504.2 km. This is the body’s size, not an orbital distance.

  3. ROUND 3

    Pluto (mean diameter) vs Moon (Earth’s moon · mean diameter)

    Moon · reference · 3,475 km
    Pluto · true diameter · 2,377 km

    1.5× shorter than the Moon

    Pluto has a mean diameter of about 2,376.6 km. This is the body’s size, not an orbital distance.

  4. ROUND 4

    Tethys (Saturn’s moon · mean diameter) vs Titan (Saturn’s moon · mean diameter)

    Titan · reference · 5,150 km
    Tethys · true diameter · 1,062 km

    4.8× shorter than Titan

    Tethys, a moon of Saturn, has a mean diameter of about 1,062.2 km. This is the body’s size, not an orbital distance.

  5. ROUND 5

    Saturn (mean diameter · globe only) vs Jupiter (mean diameter)

    Jupiter · reference · 139,800 km
    Saturn · true diameter · 116,500 km

    1.2× shorter than Jupiter

    Saturn has a mean diameter of about 116,464 km. This measures the globe, not its rings.

Beat these tomorrow

Every round is worth up to 100 points: within 6% of the true size scores 100, half or double scores 45, five times off scores zero. The daily puzzle is the same five for everyone and refreshes at midnight in your time zone; if you want more than five, Size It Up Unlimited draws fresh pairs from the whole library for as long as you like.

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MixedAnimals, planets and everyday things. AnimalsLength, height or wingspan — every round names the axis. GeographyEast–west or north–south span, never area. Pop CultureCheck the version. Compare the measured dimension. VehiclesLength end to end, or height for the ones that stand upright. DinosaursCompare estimated body length, from snout to tail tip. SpaceCompare body diameter. Rings and orbital distances are excluded. Everyday ObjectsLength, height or width — every round names the axis. InsectsBody length or wingspan — read the named measurement. LandmarksRead the named height, length or main span — including its endpoints. Food & DrinkRead the selected size and axis — length, diameter or container height.
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