ALL ANSWERS · SPACE · DAILY No. 25 · SEPTEMBER 28, 2026
Size It Up Space answer: September 28
The five Space silhouettes for September 28, 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 25 ran from Helene (36 km) to 55 Cancri (1,312,000 km). The widest gap was round 4, Kepler-22 against LHS 3844, at 4.6×; the closest call was round 2, Pandora against Helene, only 2.3× 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
K2-18 (estimated stellar diameter) vs 55 Cancri (estimated stellar diameter)
55 Cancri · reference · 1,312,000 km K2-18 · true diameter · 571,900 km 2.3× shorter than 55 Cancri
K2-18 has an estimated stellar diameter of about 571,865.4 km. This is the body’s size, not an orbital distance.
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ROUND 2
Pandora (Saturn’s moon · mean diameter) vs Helene (Saturn’s moon · mean diameter)
Helene · reference · 36 km Pandora · true diameter · 81.2 km 2.3× wider than Helene
Pandora, a moon of Saturn, has a mean diameter of about 81.2 km. This is the body’s size, not an orbital distance.
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ROUND 3
Callisto (Jupiter’s moon · mean diameter) vs Venus (mean diameter)
Venus · reference · 12,100 km Callisto · true diameter · 4,821 km 2.5× shorter than Venus
Callisto, a moon of Jupiter, has a mean diameter of about 4,820.6 km. This is the body’s size, not an orbital distance.
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ROUND 4
Kepler-22 (estimated stellar diameter) vs LHS 3844 (estimated stellar diameter)
LHS 3844 · reference · 263,000 km Kepler-22 · true diameter · 1,209,000 km 4.6× wider than LHS 3844
Kepler-22 has an estimated stellar diameter of about 1,209,126.6 km. This is the body’s size, not an orbital distance.
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ROUND 5
Triton (Neptune’s moon · mean diameter) vs Ariel (Uranus’s moon · mean diameter)
Ariel · reference · 1,158 km Triton · true diameter · 2,705 km 2.3× wider than Ariel
Triton, a moon of Neptune, has a mean diameter of about 2,705.2 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.