ALL ANSWERS · SPACE · DAILY No. 21 · SEPTEMBER 24, 2026
Size It Up Space answer: September 24
The five Space silhouettes for September 24, 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 21 ran from Atlas (30.2 km) to Kepler-10 (1,482,000 km). The widest gap was round 2, Atlas against Thebe, at 3.3×; the closest call was round 4, 55 Cancri against Kepler-10, only 1.1× 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
Kepler-186 (estimated stellar diameter) vs HD 189733 (estimated stellar diameter)
HD 189733 · reference · 1,044,000 km Kepler-186 · true diameter · 727,700 km 1.4× shorter than HD 189733
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 2
Atlas (Saturn’s moon · mean diameter) vs Thebe (Jupiter’s moon · mean diameter)
Thebe · reference · 98.6 km Atlas · true diameter · 30.2 km 3.3× shorter than Thebe
Atlas, a moon of Saturn, has a mean diameter of about 30.2 km. This is the body’s size, not an orbital distance.
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ROUND 3
TOI-700 (estimated stellar diameter) vs GJ 1214 (estimated stellar diameter)
GJ 1214 · reference · 300,800 km TOI-700 · true diameter · 585,800 km 1.9× wider than GJ 1214
TOI-700 has an estimated stellar diameter of about 585,779.4 km. This is the body’s size, not an orbital distance.
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ROUND 4
55 Cancri (estimated stellar diameter) vs Kepler-10 (estimated stellar diameter)
Kepler-10 · reference · 1,482,000 km 55 Cancri · true diameter · 1,312,000 km 1.1× shorter than Kepler-10
55 Cancri has an estimated stellar diameter of about 1,312,090.2 km. This is the body’s size, not an orbital distance.
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ROUND 5
Kepler-22 (estimated stellar diameter) vs Sun (nominal diameter)
Sun · reference · 1,391,000 km Kepler-22 · true diameter · 1,209,000 km 1.2× shorter than the Sun
Kepler-22 has an estimated stellar diameter of about 1,209,126.6 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.