Densities in kg/m3 (data is from Wikipedia; E means x 10^["n"th power])

 

1.0E−27	The universe
1.0E−22	Space in galactic arm (.0625 hydrogen atoms/cc)
1.0E−18	Space in galactic core (600 hydrogen atoms/cc); Best laboratory vacuum (1 pPa)[1]
2.0E−14	Sun's corona[2]
1.0E−13	Top of solar transition region[2]
1.0E−11	Bottom of solar transition region[2]
5.00E−6	Lower chromosphere ----------------------------------- 5 mg/cc
1.34E−5	Earth atmosphere at 82 km altitude; star Mu Cephei
1.09E−4	Earth atmosphere at 68 km altitude
2.00E−4	Solar photosphere–chromosphere boundary[2] 200 mg/cc
4.00E−4	Solar photosphere's lower boundary[2] --------- 400 mg/cc
1.00E−3	Sun just below its photosphere[2]; Vacuum from a mechanical vacuum pump
1.80E−2	Earth atmosphere at 30 km altitude[3]
9.00E−2	Hydrogen gas, the least dense substance at STP
1.60E−1	Earth atmosphere at 16 km altitude[3]
0.9	Ultralight metallic microlattice[4]
1.1	Lowest-density aerogel[5]
1.48	Earth atmosphere at sea level
10	Average low-density aerogel[5]
65	Atmosphere of Venus at surface[6]
500	Highest-density aerogel[5]
534	Lithium near room temperature
1,000	Water at 4 °C
1,062	Average human body[7]
1,408	Average of the Sun
5,515	Average of the Earth
10,490	Silver (Ag)
11,340	Lead (Pb)
13,534	Mercury (Hg)
19,100	Uranium (U)
19,250	Tungsten (W)
19,300	Gold (Au)
21,450	Platinum (Pt)
22,560	Iridium (Ir)
22,590	Osmium (Os), the densest known substance at STP
4.1E4	Hassium (Hs), estimated density, assuming that an isotope featuring a long half-life exists
6.4E4	Average density of KOI-55b, the densest known exoplanet
1.5E5	Sun's Core
1.0E9	White dwarf
2.0E13	Universe at end of the electroweak epoch
2.0E17	Atomic nuclei and neutron stars
1.0E23	Preon star
5.1E96	Planck density
∞	Black hole at singularity