Which solid materials have highest and lowest density so far discovered?
Among natural materials, the rare metals iridium and osmium, top the list.. The lightest rock is pumice, which floats in water. Artificial light materials, such as Styrofoam, have much lower density. The lightest of these is Aerogel.
The highest density physical material is neutronium, which exists in the core of neutron stars, and is packed neutrons made up of collapsed atoms. The density of a black hole is even higher, but a black hole is really not a "material."
To learn more, see http://en.wikipedia.org/wiki/Density#De … _materials
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