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metal | As used in stellar spectroscopy, any element heavier than helium. | Universe | atom | inversely proportional to the wavelength | inversely proportional to its momentum | | uncertainty principle |
metallic hydrogen | A hypothetical form of hydrogen in which the molecules have been forced by extremely high pressures to assume the lattice structure typical of metals. It is estimated that as much as 40% of Jupiter's mass (but not more than 3% of Saturn's) may be in the form of metallic hydrogen. | | | | | | |
quantum solid | A degenerate gas in which the densities are so great that the nuclei are fixed with respect to each other so that they resemble a crystalline lattice. | | | | | | |