ALL ANSWERS · SPACE · DAILY No. 43 · OCTOBER 16, 2026
Size It Up Space answer: October 16
The five Space silhouettes for October 16, 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 43 ran from Miranda (471.6 km) to 55 Cancri (1,312,000 km). The widest gap was round 5, 55 Cancri against LHS 3844, at 5.0×; the closest call was round 1, Ganymede against Mars, only 1.3× 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
Ganymede (Jupiter’s moon · mean diameter) vs Mars (mean diameter)
Mars · reference · 6,779 km Ganymede · true diameter · 5,262 km 1.3× shorter than Mars
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 2
Iapetus (Saturn’s moon · mean diameter) vs Miranda (Uranus’s moon · mean diameter)
Miranda · reference · 471.6 km Iapetus · true diameter · 1,469 km 3.1× wider than Miranda
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 3
Umbriel (Uranus’s moon · mean diameter) vs Triton (Neptune’s moon · mean diameter)
Triton · reference · 2,705 km Umbriel · true diameter · 1,169 km 2.3× shorter than Triton
Umbriel, a moon of Uranus, has a mean diameter of about 1,169.4 km. This is the body’s size, not an orbital distance.
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ROUND 4
Callisto (Jupiter’s moon · mean diameter) vs Io (Jupiter’s moon · mean diameter)
Io · reference · 3,643 km Callisto · true diameter · 4,821 km 1.3× wider than Io
Callisto, a moon of Jupiter, has a mean diameter of about 4,820.6 km. This is the body’s size, not an orbital distance.
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ROUND 5
55 Cancri (estimated stellar diameter) vs LHS 3844 (estimated stellar diameter)
LHS 3844 · reference · 263,000 km 55 Cancri · true diameter · 1,312,000 km 5.0× wider than LHS 3844
55 Cancri has an estimated stellar diameter of about 1,312,090.2 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.