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black holes

Gravitational waves help understand black-hole weight gain

Supermassive black holes: every large galaxy has one. But here’s a real conundrum: how did they grow so big? A paper recently published in Science pits the front-running ideas about the growth of supermassive black holes against observational data – a limit on the strength of gravitational waves, obtained with CSIRO’s Parkes radio telescope in Read More

Black hole surprise in ancient star cluster

Astronomers have made the unexpected discovery of two black holes inside an ancient cluster of stars in our galaxy, the Milky Way. The research, published today in the prestigious journal Nature, describes the detection of two black holes that are about 10 to 20 times heavier than our Sun in the globular cluster named M22. Read More