ALL ANSWERS · SPACE · DAILY No. 45 · OCTOBER 18, 2026
Size It Up Space answer: October 18
The five Space silhouettes for October 18, 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 45 ran from Iapetus (1,469 km) to Kepler-22 (1,209,000 km). The widest gap was round 1, Iapetus against Mars, at 4.6×; the closest call was round 5, Moon against Io, only 1.0× 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
Iapetus (Saturn’s moon · mean diameter) vs Mars (mean diameter)
Mars · reference · 6,779 km Iapetus · true diameter · 1,469 km 4.6× shorter than Mars
Iapetus, a moon of Saturn, has a mean diameter of about 1,468.6 km. This is the body’s size, not an orbital distance.
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ROUND 2
Titania (Uranus’s moon · mean diameter) vs Triton (Neptune’s moon · mean diameter)
Triton · reference · 2,705 km Titania · true diameter · 1,578 km 1.7× shorter than Triton
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.
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ROUND 3
Saturn (mean diameter · globe only) vs Neptune (mean diameter)
Neptune · reference · 49,240 km Saturn · true diameter · 116,500 km 2.4× wider than Neptune
Saturn has a mean diameter of about 116,464 km. This measures the globe, not its rings.
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ROUND 4
LHS 3844 (estimated stellar diameter) vs Kepler-22 (estimated stellar diameter)
Kepler-22 · reference · 1,209,000 km LHS 3844 · true diameter · 263,000 km 4.6× shorter than Kepler-22
LHS 3844 has an estimated stellar diameter of about 262,974.6 km. This is the body’s size, not an orbital distance.
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ROUND 5
Moon (Earth’s moon · mean diameter) vs Io (Jupiter’s moon · mean diameter)
Io · reference · 3,643 km Moon · true diameter · 3,475 km 1.0× shorter than Io
Moon, a moon of Earth, has a mean diameter of about 3,474.8 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.