The Moon takes just as long to rotate around its own axis as it does to revolve around the planet (Earth). How many other moons in the Solar System share this feature?

none
one
three
most of them
If the ro­ta­tion­al fre­quen­cy of satel­lite is larger than orbital fre­quen­cy, a small torque coun­ter­act­ing the rotation arises, even­tu­al­ly locking the fre­quen­cies in a tidal lock. Pluto and Charon are the extreme example, being locked to each other.

Answers distribution

none
one
three
most of them
answers
flagFinland
3%
0%
7%
89%
28
flagthe United Arab Emirates
4%
12%
0%
80%
25
flagIndonesia
21%
0%
0%
78%
14
flagItaly
26%
5%
8%
58%
34
flagCanada
25%
9%
6%
54%
31
flagGermany
25%
11%
10%
48%
138
flagNorway
23%
26%
3%
46%
30
flagPoland
29%
15%
9%
45%
10150
flagIndia
33%
11%
7%
45%
176
flagFrance
13%
31%
10%
44%
29
flagPakistan
27%
16%
11%
44%
18
flagthe United Kingdom
33%
14%
9%
43%
322
flagDenmark
35%
14%
7%
42%
14
flagthe United States
33%
11%
11%
41%
380
flagthe Netherlands
37%
18%
3%
40%
32
flagUkraine
33%
16%
16%
33%
18
flagRepublic of Ireland
46%
14%
10%
28%
28
flagUnknown
48%
16%
10%
26%
50
flagAustralia
40%
13%
20%
26%
15
flagthe Philippines
39%
21%
10%
25%
28

Gender

men46%
women45%
none
33%
29%
one
12%
16%
three
7%
9%
most of them
46%
45%

Details

Author: globalquiz.org
Illustration: Steve Jurvetson
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