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
16%
5%
0%
78%
37
flagFrance
11%
3%
7%
76%
26
flagGreece
11%
3%
15%
69%
26
flagAustralia
12%
11%
5%
68%
137
flagSwitzerland
11%
11%
8%
65%
35
flagCanada
16%
7%
7%
64%
77
flagthe United Kingdom
14%
11%
10%
62%
406
flagUnknown
18%
4%
18%
59%
66
flagGermany
13%
15%
11%
57%
387
flagPoland
17%
13%
14%
54%
15562
flagthe United States
17%
13%
15%
53%
1083
flagMalaysia
20%
18%
8%
53%
49
flagSouth Africa
13%
17%
20%
48%
29
flagAustria
12%
22%
18%
46%
58
flagthe United Arab Emirates
15%
3%
26%
46%
26
flagIndia
21%
18%
14%
44%
1398
flagSingapore
17%
6%
28%
44%
45
flagPakistan
15%
23%
21%
39%
138
flagthe Philippines
19%
15%
27%
36%
133
flagNigeria
20%
43%
11%
23%
60