ALL ANSWERS · SPACE · DAILY No. 38 · OCTOBER 11, 2026
Size It Up Space answer: October 11
The five Space silhouettes for October 11, 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 38 ran from Phobos (22.16 km) to Kepler-10 (1,482,000 km). The widest gap was round 4, Kepler-10 against GJ 1214, at 4.9×; the closest call was round 3, Helene against Prometheus, only 2.4× 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
Earth (mean diameter) vs Europa (Jupiter’s moon · mean diameter)
Europa · reference · 3,122 km Earth · true diameter · 12,740 km 4.1× wider than Europa
Earth has a mean diameter of about 12,742 km. This is the body’s size, not an orbital distance.
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ROUND 2
Ganymede (Jupiter’s moon · mean diameter) vs Oberon (Uranus’s moon · mean diameter)
Oberon · reference · 1,523 km Ganymede · true diameter · 5,262 km 3.5× wider than Oberon
Ganymede, a moon of Jupiter, has a mean diameter of about 5,262.4 km. This is the body’s size, not an orbital distance.
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ROUND 3
Helene (Saturn’s moon · mean diameter) vs Prometheus (Saturn’s moon · mean diameter)
Prometheus · reference · 86.2 km Helene · true diameter · 36 km 2.4× shorter than Prometheus
Helene, a moon of Saturn, has a mean diameter of about 36 km. This is the body’s size, not an orbital distance.
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ROUND 4
Kepler-10 (estimated stellar diameter) vs GJ 1214 (estimated stellar diameter)
GJ 1214 · reference · 300,800 km Kepler-10 · true diameter · 1,482,000 km 4.9× wider than GJ 1214
Kepler-10 has an estimated stellar diameter of about 1,481,841 km. This is the body’s size, not an orbital distance.
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ROUND 5
Phobos (Mars’s moon · mean diameter) vs Pandora (Saturn’s moon · mean diameter)
Pandora · reference · 81.2 km Phobos · true diameter · 22.16 km 3.7× shorter than Pandora
Phobos, a moon of Mars, has a mean diameter of about 22.2 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.