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%
6%
90%
33
flagthe United Arab Emirates
6%
9%
0%
81%
33
flagSpain
25%
6%
0%
62%
16
flagItaly
28%
5%
7%
57%
38
flagCanada
25%
12%
6%
53%
32
flagthe Netherlands
28%
19%
2%
50%
42
flagGermany
27%
11%
11%
45%
152
flagNorway
22%
29%
3%
45%
31
flagFrance
16%
29%
9%
45%
31
flagPoland
30%
15%
9%
44%
12238
flagthe United Kingdom
32%
13%
8%
44%
394
flagIndia
32%
13%
9%
43%
198
flagPakistan
31%
15%
10%
42%
19
flagthe United States
34%
11%
11%
41%
403
flagRussia
35%
17%
5%
41%
17
flagUkraine
39%
13%
13%
34%
23
flagRepublic of Ireland
46%
16%
10%
26%
30
flagAustralia
43%
12%
18%
25%
16
flagthe Philippines
37%
24%
10%
24%
29
flagUnknown
49%
16%
11%
23%
416

Gender

men42%
women45%
none
36%
28%
one
12%
16%
three
7%
9%
most of them
42%
45%

Details

Author: globalquiz.org
Illustration: Steve Jurvetson
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