ALL ANSWERS · SPACE · DAILY No. 22 · SEPTEMBER 25, 2026
Size It Up Space answer: September 25
The five Space silhouettes for September 25, 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 22 ran from Deimos (12.4 km) to GJ 436 (633,100 km). The widest gap was round 2, Venus against Europa, at 3.9×; the closest call was round 4, Amalthea against Phoebe, 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
GJ 436 (estimated stellar diameter) vs LHS 1140 (estimated stellar diameter)
LHS 1140 · reference · 300,400 km GJ 436 · true diameter · 633,100 km 2.1× wider than LHS 1140
GJ 436 has an estimated stellar diameter of about 633,087 km. This is the body’s size, not an orbital distance.
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ROUND 2
Venus (mean diameter) vs Europa (Jupiter’s moon · mean diameter)
Europa · reference · 3,122 km Venus · true diameter · 12,100 km 3.9× wider than Europa
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 3
Deimos (Mars’s moon · mean diameter) vs Metis (Jupiter’s moon · mean diameter)
Metis · reference · 43 km Deimos · true diameter · 12.4 km 3.5× shorter than Metis
Deimos, a moon of Mars, has a mean diameter of about 12.4 km. This is the body’s size, not an orbital distance.
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ROUND 4
Amalthea (Jupiter’s moon · mean diameter) vs Phoebe (Saturn’s moon · mean diameter)
Phoebe · reference · 213 km Amalthea · true diameter · 167 km 1.3× shorter than Phoebe
Amalthea, a moon of Jupiter, has a mean diameter of about 167 km. This is the body’s size, not an orbital distance.
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ROUND 5
K2-18 (estimated stellar diameter) vs TRAPPIST-1 (estimated stellar diameter)
TRAPPIST-1 · reference · 165,900 km K2-18 · true diameter · 571,900 km 3.4× wider than TRAPPIST-1
K2-18 has an estimated stellar diameter of about 571,865.4 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.