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%
5%
91%
34
flagthe United Arab Emirates
7%
7%
0%
81%
38
flagItaly
26%
4%
7%
60%
41
flagSpain
30%
5%
5%
55%
20
flagCanada
26%
11%
5%
52%
34
flagthe Netherlands
24%
20%
5%
50%
54
flagNorway
24%
27%
3%
45%
33
flagPakistan
30%
15%
10%
45%
20
flagPoland
31%
14%
9%
44%
14558
flagthe United Kingdom
34%
12%
8%
44%
426
flagIndia
31%
13%
9%
44%
213
flagGermany
28%
12%
12%
44%
183
flagFrance
18%
27%
12%
42%
33
flagthe United States
34%
11%
11%
41%
417
flagRussia
42%
15%
5%
36%
19
flagUkraine
32%
21%
14%
32%
28
flagRepublic of Ireland
45%
18%
9%
27%
33
flagUnknown
46%
17%
10%
25%
930
flagAustralia
37%
25%
12%
25%
24
flagthe Philippines
36%
26%
10%
23%
30

Gender

men41%
women46%
none
37%
28%
one
13%
16%
three
7%
8%
most of them
41%
46%

Details

Author: globalquiz.org
Illustration: Steve Jurvetson
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