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
6%
10%
0%
79%
29
flagIndonesia
21%
0%
0%
78%
14
flagSpain
26%
0%
0%
66%
15
flagItaly
27%
5%
8%
58%
36
flagCanada
25%
9%
6%
54%
31
flagthe Netherlands
30%
17%
2%
48%
39
flagGermany
25%
11%
11%
47%
142
flagNorway
23%
26%
3%
46%
30
flagPoland
29%
15%
9%
45%
10841
flagthe United Kingdom
32%
13%
8%
45%
362
flagFrance
16%
29%
9%
45%
31
flagIndia
33%
12%
8%
44%
193
flagPakistan
27%
16%
11%
44%
18
flagthe United States
34%
11%
11%
41%
397
flagUkraine
39%
13%
13%
34%
23
flagRepublic of Ireland
44%
17%
10%
27%
29
flagAustralia
40%
13%
20%
26%
15
flagthe Philippines
37%
24%
10%
24%
29
flagUnknown
45%
20%
12%
22%
75

Gender

men47%
women45%
none
32%
28%
one
12%
16%
three
7%
8%
most of them
47%
45%

Details

Author: globalquiz.org
Illustration: Steve Jurvetson
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