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
flagthe Netherlands
14%
5%
0%
79%
34
flagFrance
12%
0%
8%
79%
24
flagAustralia
12%
11%
5%
68%
135
flagGreece
12%
4%
16%
68%
25
flagCanada
17%
7%
7%
64%
76
flagSwitzerland
13%
10%
10%
63%
30
flagthe United Kingdom
14%
11%
10%
62%
386
flagUnknown
18%
4%
18%
59%
66
flagGermany
13%
16%
11%
56%
342
flagPoland
17%
13%
14%
54%
15383
flagthe United States
17%
13%
15%
53%
1061
flagMalaysia
20%
18%
8%
52%
48
flagSouth Africa
13%
17%
20%
48%
29
flagthe United Arab Emirates
12%
4%
28%
48%
25
flagIndia
21%
19%
14%
44%
1326
flagAustria
11%
23%
21%
44%
52
flagSingapore
18%
6%
27%
44%
43
flagPakistan
14%
23%
20%
39%
134
flagthe Philippines
19%
15%
25%
37%
131
flagNigeria
15%
45%
11%
25%
51