Gravitational Waves Help Test Models for Black-hole Growth

Supermassive black holes: every large galaxy's got one. But here's a real conundrum: how did they grow so big? A paper in the October 17, 2013, issue of 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 ... (more)

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