Size It Up

ALL ANSWERS · SPACE · DAILY No. 7 · SEPTEMBER 10, 2026

Size It Up Space answer: September 10

The five Space silhouettes for September 10, 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 7 ran from Mimas (396.4 km) to the Sun (1,391,000 km). The widest gap was round 1, Sun against Jupiter, at 10.0×; the closest call was round 3, Titan against Moon, only 1.5× apart — the kind of round that separates a 90 from a 60.

  1. ROUND 1

    Sun (nominal diameter) vs Jupiter (mean diameter)

    Jupiter · reference · 139,800 km
    Sun · true diameter · 1,391,000 km

    10.0× wider than Jupiter

    Sun has a nominal photospheric diameter of about 1,391,400 km. This is the body’s size, not an orbital distance.

  2. ROUND 2

    Ganymede (Jupiter’s moon · mean diameter) vs Tethys (Saturn’s moon · mean diameter)

    Tethys · reference · 1,062 km
    Ganymede · true diameter · 5,262 km

    5.0× wider than Tethys

    Ganymede, a moon of Jupiter, has a mean diameter of about 5,262.4 km. This is the body’s size, not an orbital distance.

  3. ROUND 3

    Titan (Saturn’s moon · mean diameter) vs Moon (Earth’s moon · mean diameter)

    Moon · reference · 3,475 km
    Titan · true diameter · 5,150 km

    1.5× wider than the Moon

    Titan, a moon of Saturn, has a mean diameter of about 5,149.5 km. This is the body’s size, not an orbital distance.

  4. ROUND 4

    Mimas (Saturn’s moon · mean diameter) vs Umbriel (Uranus’s moon · mean diameter)

    Umbriel · reference · 1,169 km
    Mimas · true diameter · 396.4 km

    3.0× shorter than Umbriel

    Mimas, a moon of Saturn, has a mean diameter of about 396.4 km. This is the body’s size, not an orbital distance.

  5. ROUND 5

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

    Venus · reference · 12,100 km
    Saturn · true diameter · 116,500 km

    9.6× wider than Venus

    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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