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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Very interesting!
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Answers by country

planets of the Solar System
galaxies
quasars
pulsars
answers
flagCanada
36%
8%
16%
40%
25
flagPakistan
42%
5%
10%
36%
19
flagGreece
33%
0%
33%
33%
12
flagPoland
34%
16%
15%
32%
7253
flagthe United Kingdom
37%
12%
15%
31%
85
flagthe United States
35%
19%
17%
26%
215
flagRussia
40%
18%
15%
25%
32
flagUkraine
43%
10%
16%
24%
37
flagIndia
34%
19%
22%
22%
238
flagUnknown
31%
15%
31%
21%
32
flagAustralia
32%
14%
28%
21%
28
flagthe Netherlands
40%
20%
20%
20%
10
flagthe Philippines
72%
8%
12%
4%
25
flagGermany
61%
19%
14%
4%
21