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%
2%
80%
42
flagSwitzerland
13%
6%
11%
68%
45
flagItaly
27%
4%
6%
60%
43
flagSweden
9%
21%
9%
60%
33
flagthe Netherlands
19%
17%
4%
58%
73
flagCanada
27%
16%
6%
46%
43
flagGermany
29%
11%
11%
45%
222
flagFrance
16%
24%
13%
45%
37
flagPoland
30%
14%
9%
44%
15951
flagNorway
26%
23%
5%
44%
38
flagthe United Kingdom
34%
13%
8%
43%
463
flagIndia
32%
14%
7%
43%
265
flagRussia
28%
17%
7%
42%
28
flagthe United States
33%
12%
11%
41%
469
flagRepublic of Ireland
44%
17%
8%
29%
34
flagUkraine
35%
19%
16%
29%
31
flagUnknown
46%
17%
11%
24%
1005
flagAustralia
41%
20%
13%
24%
29
flagthe Philippines
35%
27%
13%
21%
37

Gender

men41%
women47%
none
37%
27%
one
13%
16%
three
8%
8%
most of them
41%
47%

Details

Author: globalquiz.org
Illustration: Steve Jurvetson
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