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JP, what about photons? They are kinda small, and they have a sort of mass too, or would that not work?
Platinum is extremely dense, but I think Osmium (presumably named after Donny) is the densest.
If you're not talking about large objects, then probably an electron or some similar subatomic particle. When these particles form atoms and then matter, most of that matter is empty space, so it's not nearly as dense.Actually, neutron stars get so dense because this empty space has been collapsed away through the force of gravity.
If you considered just the density of a single atomic nucleus, then you would approach that of a neutron star. However, when looking at multiple atoms then you would have to look at crystal or liquid densities... here is a list of elements from Wikipedia. There is some dispute on whether Osmium or Iridium should top the list....sorry, you cannot view external links. To see them, please
REGISTER or LOGINOsmium (Os) 22.61 g/cm3Iridium (Ir 22.56 g/cm3Platinum (Pt) 21.46 g/cm3Rhenium (Re) 21.02 g/cm3Neptunium (Np) 20.45 g/cm3Plutonium (Pu) 19.84 g/cm3Gold (Au) 19.282 g/cm3Tungsten (W) 19.25 g/cm3Uranium (U) 18.95 g/cm3Water (H2O) 1 g/cm3It is possible that there would be some metallic alloy of the above materials that would have a slightly greater density.The Sun, and Jupiter, both have high density plasmas (I think). But, I don't believe they naturally occur on Earth. Some plasma is created with electrical arcs.
the core of the earth?
Quote from: Geezer on 27/03/2011 21:33:28JP, what about photons? They are kinda small, and they have a sort of mass too, or would that not work?Really? That's news to me!...Although I just read "Photons inside superconductors do develop a nonzero effective rest mass; as a result, electromagnetic forces become short-range inside superconductors." on ...sorry, you cannot view external links. To see them, please
REGISTER or LOGIN- not that I understand that I have to say!Neil - I'm going to postulate that some of that, like, really DARK chocolate cake you can get in only the POSHEST restaurants would qualify! 
Quote from: Geezer on 27/03/2011 21:33:28JP, what about photons? They are kinda small, and they have a sort of mass too, or would that not work?Really? That's news to me!
But I don't think you could approach energy densities equivalent to the energy density of a neutron star, at least not on earth, since neutrons have actual mass and E=mc2 means a tiny bit of mass gives a huge amount of energy.
Quote from: CZARCAR on 27/03/2011 22:43:59the core of the earth?That's a good point ! Thanks CZARCAR......I can imagine it being quite dense indeed !