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And another interesting property about dark matter is that particles, if they're relatively light, about 5% of the mass of an electron would be considered if given the, the, it's termed as being warm. And if it's that, this would inhibit the formation of things smaller than galaxies. And if the particles are heavier, they would be classed as the pool, and would promote small-scale structure. So in his study, a study that focused on small gas clouds that were around during the cosmic dark ages, just dropped in.