ALL ANSWERS · SPACE · DAILY No. 46 · OCTOBER 19, 2026
Size It Up Space answer: October 19
The five Space silhouettes for October 19, 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 46 ran from Mimas (396.4 km) to Kepler-186 (727,700 km). The widest gap was round 2, Kepler-186 against TRAPPIST-1, at 4.4×; the closest call was round 3, Ceres against Umbriel, only 1.2× apart — the kind of round that separates a 90 from a 60.
SPOILER · TODAY’S FIVE
You have not finished today’s puzzle on this device. The answers below are blurred so you can still play first.
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ROUND 1
Oberon (Uranus’s moon · mean diameter) vs Pluto (mean diameter)
Pluto · reference · 2,377 km Oberon · true diameter · 1,523 km 1.6× shorter than Pluto
Oberon, a moon of Uranus, has a mean diameter of about 1,522.8 km. This is the body’s size, not an orbital distance.
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ROUND 2
Kepler-186 (estimated stellar diameter) vs TRAPPIST-1 (estimated stellar diameter)
TRAPPIST-1 · reference · 165,900 km Kepler-186 · true diameter · 727,700 km 4.4× wider than TRAPPIST-1
Kepler-186 has an estimated stellar diameter of about 727,702.2 km. This is the body’s size, not an orbital distance.
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ROUND 3
Ceres (mean diameter) vs Umbriel (Uranus’s moon · mean diameter)
Umbriel · reference · 1,169 km Ceres · true diameter · 939.4 km 1.2× shorter than Umbriel
Ceres has a mean diameter of about 939.4 km. This is the body’s size, not an orbital distance.
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ROUND 4
Tethys (Saturn’s moon · mean diameter) vs Mimas (Saturn’s moon · mean diameter)
Mimas · reference · 396.4 km Tethys · true diameter · 1,062 km 2.7× wider than Mimas
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.
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ROUND 5
Titan (Saturn’s moon · mean diameter) vs Venus (mean diameter)
Venus · reference · 12,100 km Titan · true diameter · 5,150 km 2.4× shorter than Venus
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.
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.