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
2%
0%
8%
88%
35
flagthe United Arab Emirates
7%
7%
2%
80%
42
flagSwitzerland
12%
6%
10%
70%
47
flagthe Netherlands
17%
16%
3%
62%
79
flagSweden
8%
19%
11%
61%
36
flagItaly
27%
4%
6%
60%
43
flagPakistan
23%
13%
10%
53%
30
flagGermany
29%
11%
12%
45%
224
flagCanada
29%
15%
6%
45%
44
flagFrance
16%
24%
13%
45%
37
flagPoland
30%
14%
9%
44%
16520
flagNorway
26%
23%
5%
44%
38
flagthe United Kingdom
34%
13%
8%
43%
473
flagthe United States
33%
12%
11%
41%
484
flagIndia
33%
15%
8%
40%
305
flagRussia
33%
16%
7%
40%
42
flagRepublic of Ireland
40%
16%
8%
35%
37
flagUkraine
39%
18%
15%
27%
33
flagUnknown
46%
17%
11%
24%
1029
flagthe Philippines
34%
28%
13%
21%
38

Gender

men41%
women48%
none
37%
27%
one
13%
16%
three
7%
8%
most of them
41%
48%

Details

Author: globalquiz.org
Illustration: Steve Jurvetson
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