ALL ANSWERS · SPACE · DAILY No. 26 · SEPTEMBER 29, 2026
Size It Up Space answer: September 29
The five Space silhouettes for September 29, 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 26 ran from Thebe (98.6 km) to HD 189733 (1,044,000 km). The widest gap was round 3, Thebe against Mimas, at 4.0×; the closest call was round 5, Titania against Umbriel, only 1.3× 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
Proxima Centauri (estimated stellar diameter) vs GJ 436 (estimated stellar diameter)
GJ 436 · reference · 633,100 km Proxima Centauri · true diameter · 196,200 km 3.2× shorter than GJ 436
Proxima Centauri has an estimated stellar diameter of about 196,187.4 km. This is the body’s size, not an orbital distance.
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ROUND 2
HD 189733 (estimated stellar diameter) vs LHS 1140 (estimated stellar diameter)
LHS 1140 · reference · 300,400 km HD 189733 · true diameter · 1,044,000 km 3.5× wider than LHS 1140
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 3
Thebe (Jupiter’s moon · mean diameter) vs Mimas (Saturn’s moon · mean diameter)
Mimas · reference · 396.4 km Thebe · true diameter · 98.6 km 4.0× shorter than Mimas
Thebe, a moon of Jupiter, has a mean diameter of about 98.6 km. This is the body’s size, not an orbital distance.
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ROUND 4
TRAPPIST-1 (estimated stellar diameter) vs GJ 1214 (estimated stellar diameter)
GJ 1214 · reference · 300,800 km TRAPPIST-1 · true diameter · 165,900 km 1.8× shorter than GJ 1214
TRAPPIST-1 has an estimated stellar diameter of about 165,854.9 km. This is the body’s size, not an orbital distance.
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ROUND 5
Titania (Uranus’s moon · mean diameter) vs Umbriel (Uranus’s moon · mean diameter)
Umbriel · reference · 1,169 km Titania · true diameter · 1,578 km 1.3× wider than Umbriel
Titania, a moon of Uranus, has a mean diameter of about 1,577.8 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.