LV-426 from Alien is stated to have a diameter of 1,200 km and a surface gravity of 0.86g.
That comes out to a density of 20.45 g/cm^3!
Accounting for a skin of other materials to make the overall density lower than the primary materials...
LV-426 must be made from iridium, osmium, platinum or rhenium.
No wonder Weyland Yutani wanted to colonize the place.
Think of all the catalytic converters you could make... Oh, wait...
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