ALL ANSWERS · SPACE · DAILY No. 54 · OCTOBER 27, 2026
Size It Up Space answer: October 27
The five Space silhouettes for October 27, 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 54 ran from Umbriel (1,169 km) to LHS 1140 (300,400 km). The widest gap was round 4, Kepler-186 f against Moon, at 4.3×; the closest call was round 3, TOI-700 d against TRAPPIST-1 b, only 1.0× 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
Umbriel (Uranus’s moon · mean diameter) vs Io (Jupiter’s moon · mean diameter)
Io · reference · 3,643 km Umbriel · true diameter · 1,169 km 3.1× shorter than Io
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.
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ROUND 2
HD 209458 b (estimated planetary diameter) vs LHS 1140 (estimated stellar diameter)
LHS 1140 · reference · 300,400 km HD 209458 b · true diameter · 198,700 km 1.5× shorter than LHS 1140
HD 209458 b has an estimated planetary diameter of about 198,748.1 km. This is the body’s size, not an orbital distance.
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ROUND 3
TOI-700 d (estimated planetary diameter) vs TRAPPIST-1 b (estimated planetary diameter)
TRAPPIST-1 b · reference · 14,240 km TOI-700 d · true diameter · 14,610 km 1.0× wider than TRAPPIST-1 b
TOI-700 d has an estimated planetary diameter of about 14,605.8 km. This is the body’s size, not an orbital distance.
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ROUND 4
Kepler-186 f (estimated planetary diameter) vs Moon (Earth’s moon · mean diameter)
Moon · reference · 3,475 km Kepler-186 f · true diameter · 14,920 km 4.3× wider than the Moon
Kepler-186 f has an estimated planetary diameter of about 14,924.8 km. This is the body’s size, not an orbital distance.
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ROUND 5
GJ 3470 b (estimated planetary diameter) vs Kepler-10 b (estimated planetary diameter)
Kepler-10 b · reference · 18,750 km GJ 3470 b · true diameter · 58,300 km 3.1× wider than Kepler-10 b
GJ 3470 b has an estimated planetary diameter of about 58,295.8 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.