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This plaque, carried by Pioneer 10 and Pioneer 11 space probes, describes the location of the Sun. What are the points at the ends of the lines?

planets of the Solar System
galaxies
quasars
pulsars
Each of the line includes binary encoding of pulsar frequency, so these can be easily recognized. The hydrogen spin-flip transition frequency is used as the unit of time (Hydrogen particle at the top of the image).
Sophie Letherman
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Answers by country

planets of the Solar System
galaxies
quasars
pulsars
answers
flagCanada
40%
6%
12%
40%
32
flagthe United Arab Emirates
45%
9%
9%
36%
11
flagGreece
23%
17%
23%
35%
17
flagPoland
32%
16%
15%
33%
8877
flagthe United Kingdom
35%
11%
16%
33%
137
flagBelarus
25%
20%
25%
30%
20
flagthe United States
34%
17%
16%
29%
295
flagPakistan
39%
15%
12%
27%
33
flagAustria
20%
33%
20%
26%
15
flagAustralia
28%
10%
33%
25%
39
flagFrance
35%
15%
20%
25%
20
flagRussia
38%
19%
15%
22%
126
flagGermany
48%
15%
13%
22%
45
flagUkraine
46%
13%
14%
21%
119
flagUnknown
31%
15%
31%
21%
32
flagIndia
35%
20%
23%
19%
407
flagthe Netherlands
30%
26%
21%
17%
23
flagKazakhstan
31%
18%
31%
12%
16
flagRepublic of Ireland
63%
9%
9%
9%
11
flagthe Philippines
63%
8%
19%
5%
36

Does the candle burn more or less violently in zero gravity?

more violently
about the same
less violently
nobody knows

Who built the first rocket powerful enough to enter outer space?

Americans
Russians
Chinese
Germans

Which space rocket was the most powerful ever?

Atlas V
Ariane 5
Saturn V
Proton

Typically, how many artillery decks were in the sailing ships of the line?

one
two
three
four