<P> A supersolid is a spatially ordered material (that is, a solid or crystal) with superfluid properties . Similar to a superfluid, a supersolid is able to move without friction but retains a rigid shape . Although a supersolid is a solid, it exhibits so many characteristic properties different from other solids that many argue it is another state of matter . </P> <P> In a string - net liquid, atoms have apparently unstable arrangement, like a liquid, but are still consistent in overall pattern, like a solid . When in a normal solid state, the atoms of matter align themselves in a grid pattern, so that the spin of any electron is the opposite of the spin of all electrons touching it . But in a string - net liquid, atoms are arranged in some pattern that requires some electrons to have neighbors with the same spin . This gives rise to curious properties, as well as supporting some unusual proposals about the fundamental conditions of the universe itself . </P> <P> A superglass is a phase of matter characterized, at the same time, by superfluidity and a frozen amorphous structure . </P> <P> While dark matter is estimated to comprise 83% of the mass of matter in the universe, most of its properties remain a mystery due to the fact that it neither absorbs nor emits electromagnetic radiation, and there are many competing theories regarding what dark matter is actually made of . Thus, while it is hypothesized to exist and comprise the vast majority of matter in the universe, almost all of its properties are unknown and a matter of speculation, because it has only been observed through its gravitational effects . </P>

Which of the following is a state of matter