ALL ANSWERS · SPACE · DAILY No. 39 · OCTOBER 12, 2026
Size It Up Space answer: October 12
The five Space silhouettes for October 12, 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 39 ran from Epimetheus (116.4 km) to LHS 3844 (263,000 km). The widest gap was round 3, Uranus against Venus, at 4.2×; the closest call was round 5, Hyperion against Mimas, only 1.5× 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
Janus (Saturn’s moon · mean diameter) vs Epimetheus (Saturn’s moon · mean diameter)
Epimetheus · reference · 116.4 km Janus · true diameter · 178.4 km 1.5× wider than Epimetheus
Janus, a moon of Saturn, has a mean diameter of about 178.4 km. This is the body’s size, not an orbital distance.
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ROUND 2
Saturn (mean diameter · globe only) vs LHS 3844 (estimated stellar diameter)
LHS 3844 · reference · 263,000 km Saturn · true diameter · 116,500 km 2.3× shorter than LHS 3844
Saturn has a mean diameter of about 116,464 km. This measures the globe, not its rings.
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ROUND 3
Uranus (mean diameter) vs Venus (mean diameter)
Venus · reference · 12,100 km Uranus · true diameter · 50,720 km 4.2× wider than Venus
Uranus has a mean diameter of about 50,724 km. This is the body’s size, not an orbital distance.
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ROUND 4
Mars (mean diameter) vs Io (Jupiter’s moon · mean diameter)
Io · reference · 3,643 km Mars · true diameter · 6,779 km 1.9× wider than Io
Mars has a mean diameter of about 6,779 km. This is the body’s size, not an orbital distance.
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ROUND 5
Hyperion (Saturn’s moon · mean diameter) vs Mimas (Saturn’s moon · mean diameter)
Mimas · reference · 396.4 km Hyperion · true diameter · 270 km 1.5× shorter than Mimas
Hyperion, a moon of Saturn, has a mean diameter of about 270 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.