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%
10%
84%
19
flagthe Netherlands
13%
6%
0%
79%
29
flagAustralia
13%
14%
7%
65%
114
flagthe United Kingdom
14%
11%
9%
63%
326
flagCanada
17%
8%
7%
63%
68
flagRomania
26%
10%
0%
63%
19
flagUnknown
18%
4%
18%
59%
66
flagGermany
13%
16%
11%
57%
200
flagPoland
17%
13%
14%
54%
14453
flagMalaysia
21%
17%
8%
52%
46
flagSouth Africa
13%
13%
21%
52%
23
flagIndonesia
13%
26%
8%
52%
23
flagthe United States
18%
13%
15%
51%
999
flagthe United Arab Emirates
13%
0%
27%
50%
22
flagAustria
10%
31%
10%
47%
19
flagIndia
21%
19%
13%
44%
1098
flagSingapore
18%
7%
28%
42%
38
flagPakistan
15%
24%
20%
39%
119
flagthe Philippines
21%
16%
24%
35%
113
flagNigeria
13%
45%
10%
27%
37