ALL ANSWERS · SPACE · DAILY No. 27 · SEPTEMBER 30, 2026
Size It Up Space answer: September 30
The five Space silhouettes for September 30, 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 27 ran from Deimos (12.4 km) to 55 Cancri (1,312,000 km). The widest gap was round 5, Prometheus against Proteus, at 4.8×; the closest call was round 4, Phobos against Deimos, only 1.8× 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
Dione (Saturn’s moon · mean diameter) vs Callisto (Jupiter’s moon · mean diameter)
Callisto · reference · 4,821 km Dione · true diameter · 1,123 km 4.3× shorter than Callisto
Dione, a moon of Saturn, has a mean diameter of about 1,122.8 km. This is the body’s size, not an orbital distance.
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ROUND 2
TOI-700 (estimated stellar diameter) vs 55 Cancri (estimated stellar diameter)
55 Cancri · reference · 1,312,000 km TOI-700 · true diameter · 585,800 km 2.2× shorter than 55 Cancri
TOI-700 has an estimated stellar diameter of about 585,779.4 km. This is the body’s size, not an orbital distance.
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ROUND 3
Venus (mean diameter) vs Io (Jupiter’s moon · mean diameter)
Io · reference · 3,643 km Venus · true diameter · 12,100 km 3.3× wider than Io
Venus has a mean diameter of about 12,103.6 km. This is the body’s size, not an orbital distance.
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ROUND 4
Phobos (Mars’s moon · mean diameter) vs Deimos (Mars’s moon · mean diameter)
Deimos · reference · 12.4 km Phobos · true diameter · 22.16 km 1.8× wider than Deimos
Phobos, a moon of Mars, has a mean diameter of about 22.2 km. This is the body’s size, not an orbital distance.
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ROUND 5
Prometheus (Saturn’s moon · mean diameter) vs Proteus (Neptune’s moon · mean diameter)
Proteus · reference · 416 km Prometheus · true diameter · 86.2 km 4.8× shorter than Proteus
Prometheus, a moon of Saturn, has a mean diameter of about 86.2 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.