A visualisation of gravitational waves emitted by two orbiting supermassive black holes. CSIRO

Where are the missing gravitational waves?

A new study has failed to find evidence of gravitational waves, but that doesn’t mean Einstein was wrong about their existence.
New research shows supermassive black holes are bigger than the sum of their parts. NASA/CXC/A.Hobart

When galaxies collide: the growth of supermassive black holes

Galaxies may look pretty and delicate, with their swirls of stars of many colours - but don’t be fooled. At the heart of every galaxy lies a supermassive black hole, including in our own Milky Way. Black…

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