What is the densest substance in the universe?

osmium
diamond
core of the Sun
neutron star
A neutron star is a stellar remnant of a supernova. Neutron stars are very small, but extremely dense - with a radius of only about 12–13 km (7 mi), they can have a mass of about two Suns.
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Answers by country

osmium
diamond
core of the Sun
neutron star
answers
flagGreece
5%
0%
11%
82%
17
flagthe Netherlands
16%
8%
0%
76%
25
flagSwitzerland
14%
14%
7%
64%
14
flagRomania
26%
10%
0%
63%
19
flagthe United Kingdom
13%
12%
9%
62%
293
flagAustralia
14%
14%
8%
62%
83
flagCanada
18%
9%
6%
62%
64
flagGermany
17%
12%
10%
59%
122
flagUnknown
18%
4%
18%
59%
66
flagIndonesia
13%
22%
9%
54%
22
flagPoland
17%
13%
14%
53%
13952
flagMalaysia
22%
15%
10%
52%
40
flagSouth Africa
14%
9%
23%
52%
21
flagthe United States
18%
13%
15%
51%
963
flagthe United Arab Emirates
13%
0%
27%
50%
22
flagIndia
21%
20%
13%
43%
940
flagPakistan
16%
25%
17%
39%
103
flagSingapore
20%
8%
29%
38%
34
flagthe Philippines
21%
15%
25%
36%
99
flagNigeria
14%
44%
11%
26%
34