ALL ANSWERS · SPACE · DAILY No. 47 · OCTOBER 20, 2026
Size It Up Space answer: October 20
The five Space silhouettes for October 20, 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 47 ran from Deimos (12.4 km) to Io (3,643 km). The widest gap was round 3, Rhea against Enceladus, at 3.0×; the closest call was round 1, Miranda against Hyperion, only 1.7× 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
Miranda (Uranus’s moon · mean diameter) vs Hyperion (Saturn’s moon · mean diameter)
Hyperion · reference · 270 km Miranda · true diameter · 471.6 km 1.7× wider than Hyperion
Miranda, a moon of Uranus, has a mean diameter of about 471.6 km. This is the body’s size, not an orbital distance.
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ROUND 2
Europa (Jupiter’s moon · mean diameter) vs Iapetus (Saturn’s moon · mean diameter)
Iapetus · reference · 1,469 km Europa · true diameter · 3,122 km 2.1× wider than Iapetus
Europa, a moon of Jupiter, has a mean diameter of about 3,121.6 km. This is the body’s size, not an orbital distance.
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ROUND 3
Rhea (Saturn’s moon · mean diameter) vs Enceladus (Saturn’s moon · mean diameter)
Enceladus · reference · 504.2 km Rhea · true diameter · 1,527 km 3.0× wider than Enceladus
Rhea, a moon of Saturn, has a mean diameter of about 1,527 km. This is the body’s size, not an orbital distance.
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ROUND 4
Charon (Pluto’s moon · mean diameter) vs Io (Jupiter’s moon · mean diameter)
Io · reference · 3,643 km Charon · true diameter · 1,212 km 3.0× shorter than Io
Charon, a moon of Pluto, has a mean diameter of about 1,212 km. This is the body’s size, not an orbital distance.
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ROUND 5
Deimos (Mars’s moon · mean diameter) vs Phobos (Mars’s moon · mean diameter)
Phobos · reference · 22.16 km Deimos · true diameter · 12.4 km 1.8× shorter than Phobos
Deimos, a moon of Mars, has a mean diameter of about 12.4 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.