The black holes orbit each other, and get closer and closer. This emits gravity ...

		simonh 45 days ago \| parent \| context \| favorite \| on: LIGO detects most massive black hole merger to dat... The black holes orbit each other, and get closer and closer. This emits gravity waves, and when they merge a large proportion of their combined mass gets emitted as gravity waves. These are what LIGO is detecting.