What part of the Moon surface had been known to humanity before the first photos of the dark side were taken in 1959?

50%
59%
80%
100%
Moon's li­bra­tion changes the angle from which the Moon is seen, allowing about 59% of its surface to be seen from the Earth (but only half at any in­stan­t). Moon's li­bra­tion is caused by the ec­cen­tric­i­ty of its orbit around Earth and by a slight in­cli­na­tion of its axis of ro­ta­tion.

Answers distribution

50%
59%
80%
100%
answers
flagFinland
0%
100%
0%
0%
71
flagSpain
11%
85%
0%
3%
27
flagItaly
9%
81%
7%
1%
64
flagNew Zealand
19%
76%
0%
4%
21
flagFrance
25%
72%
0%
2%
43
flagGermany
24%
66%
4%
2%
218
flagPoland
28%
60%
7%
3%
11553
flagthe United Arab Emirates
25%
57%
7%
10%
28
flagSwitzerland
31%
57%
0%
5%
19
flagthe United Kingdom
28%
56%
8%
4%
384
flagRepublic of Ireland
25%
55%
14%
3%
27
flagIndia
34%
50%
10%
2%
246
flagthe United States
38%
47%
8%
3%
504
flagthe Netherlands
38%
44%
11%
2%
34
flagUnknown
47%
43%
5%
3%
53
flagCanada
40%
42%
12%
4%
47
flagNorway
44%
41%
10%
3%
29
flagthe Philippines
31%
40%
21%
3%
32
flagPakistan
36%
36%
21%
5%
19
flagAustralia
38%
28%
19%
9%
21

Gender

men65%
women63%
50%
25%
25%
59%
65%
63%
80%
6%
8%
100%
3%
2%

Language versions

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answers
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What part of the Moon surface had been known to humanity before the first photos of the dark side were taken in 1959?
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