ALL ANSWERS · SPACE · DAILY No. 37 · OCTOBER 10, 2026
Size It Up Space answer: October 10
The five Space silhouettes for October 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 37 ran from Proteus (416 km) to HD 209458 (1,656,000 km). The widest gap was round 3, HD 189733 against GJ 1132, at 3.4×; the closest call was round 5, Sun against HD 209458, 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
Saturn (mean diameter · globe only) vs Proxima Centauri (estimated stellar diameter)
Proxima Centauri · reference · 196,200 km Saturn · true diameter · 116,500 km 1.7× shorter than Proxima Centauri
Saturn has a mean diameter of about 116,464 km. This measures the globe, not its rings.
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ROUND 2
Proteus (Neptune’s moon · mean diameter) vs Charon (Pluto’s moon · mean diameter)
Charon · reference · 1,212 km Proteus · true diameter · 416 km 2.9× shorter than Charon
Proteus, a moon of Neptune, has a mean diameter of about 416 km. This is the body’s size, not an orbital distance.
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ROUND 3
HD 189733 (estimated stellar diameter) vs GJ 1132 (estimated stellar diameter)
GJ 1132 · reference · 307,600 km HD 189733 · true diameter · 1,044,000 km 3.4× wider than GJ 1132
HD 189733 has an estimated stellar diameter of about 1,043,550 km. This is the body’s size, not an orbital distance.
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ROUND 4
GJ 436 (estimated stellar diameter) vs 55 Cancri (estimated stellar diameter)
55 Cancri · reference · 1,312,000 km GJ 436 · true diameter · 633,100 km 2.1× shorter than 55 Cancri
GJ 436 has an estimated stellar diameter of about 633,087 km. This is the body’s size, not an orbital distance.
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ROUND 5
Sun (nominal diameter) vs HD 209458 (estimated stellar diameter)
HD 209458 · reference · 1,656,000 km Sun · true diameter · 1,391,000 km 1.2× shorter than HD 209458
Sun has a nominal photospheric diameter of about 1,391,400 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.