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
13%
6%
0%
79%
43
flagGreece
10%
3%
14%
71%
28
flagFrance
16%
3%
10%
70%
30
flagAustralia
13%
10%
7%
66%
159
flagCanada
16%
8%
9%
63%
85
flagthe United Kingdom
13%
12%
11%
61%
454
flagUnknown
18%
4%
18%
59%
66
flagGermany
13%
16%
10%
58%
585
flagSwitzerland
11%
17%
11%
57%
45
flagPoland
16%
13%
14%
55%
16201
flagAustria
10%
19%
15%
54%
92
flagthe United States
17%
13%
15%
53%
1156
flagthe United Arab Emirates
13%
6%
23%
50%
30
flagMalaysia
20%
16%
13%
48%
60
flagSouth Africa
20%
14%
17%
48%
35
flagSingapore
18%
10%
26%
44%
50
flagIndia
21%
18%
15%
42%
1579
flagPakistan
16%
23%
20%
39%
156
flagthe Philippines
19%
14%
25%
38%
144
flagNigeria
22%
42%
11%
21%
96