What Is the Densest Matter?

At the modest temperatures and pressures of Earth's surface, the densest known material is the metallic element osmium, which packs 22 grams into 1 cubic centimetre, or more than 100 grams into a teaspoonful. Even osmium is full of fluff, however, in the form of electron clouds that separate the dense atomic nuclei.

Which is the most densest thing in the universe?

A neutron star is the most intensely dense object in all the universe.

Is there anything denser than osmium?

Both osmium and iridium are very dense metals, each weighing approximately twice as much as lead. ... At room temperature and a pressure above 2.98 GPa, iridium is denser than osmium, with a density of 22.75 grams per cubic centimeter.