Really dark matter: Is the universe made of holes?: ...he found something unexpected: thousands of objects that were brightening and dimming extremely slowly. They turned out to be quasars...
He wondered if the variability was down to a phenomenon called microlensing...
...to see the effect with every quasar, which we do, means the bodies bending the light around must add up to far more than double the number of baryons we see in the universe. "There just isn't enough baryonic matter for the lenses to be ordinary stars," says Hawkins. "They must be dark matter."...
if everything made of ordinary matter is ruled out, that leaves Hawkins with only one candidate: small black holes weighing about the mass of the sun...
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