ALL ANSWERS · SPACE · DAILY No. 6 · SEPTEMBER 9, 2026
Size It Up Space answer: September 9
The five Space silhouettes for September 9, 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 6 ran from Miranda (471.6 km) to Uranus (50,720 km). The widest gap was round 1, Uranus against Earth, at 4.0×; the closest call was round 5, Iapetus against Dione, 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.
-
ROUND 1
Uranus (mean diameter) vs Earth (mean diameter)
Earth · reference · 12,740 km Uranus · true diameter · 50,720 km 4.0× wider than Earth
Uranus has a mean diameter of about 50,724 km. This is the body’s size, not an orbital distance.
-
ROUND 2
Titania (Uranus’s moon · mean diameter) vs Callisto (Jupiter’s moon · mean diameter)
Callisto · reference · 4,821 km Titania · true diameter · 1,578 km 3.1× shorter than Callisto
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.
-
ROUND 3
Mercury (mean diameter) vs Io (Jupiter’s moon · mean diameter)
Io · reference · 3,643 km Mercury · true diameter · 4,879 km 1.3× wider than Io
Mercury has a mean diameter of about 4,878.8 km. This is the body’s size, not an orbital distance.
-
ROUND 4
Miranda (Uranus’s moon · mean diameter) vs Rhea (Saturn’s moon · mean diameter)
Rhea · reference · 1,527 km Miranda · true diameter · 471.6 km 3.2× shorter than Rhea
Miranda, a moon of Uranus, has a mean diameter of about 471.6 km. This is the body’s size, not an orbital distance.
-
ROUND 5
Iapetus (Saturn’s moon · mean diameter) vs Dione (Saturn’s moon · mean diameter)
Dione · reference · 1,123 km Iapetus · true diameter · 1,469 km 1.3× wider than Dione
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.
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.