Baby Black Holes: How Detectors Will Hear Their First Cry
When the universe was a couple of hundred million years old, it resembled a giant kitchen where the first galaxies were being shaped from primordial 'dough'—hydrogen and helium. At their centers, black holes ignited like ovens of varying power, from light 'camp stoves' to heavy 'hearths.' But how quickly did they gain mass by swallowing surrounding gas?