According to a new analysis of a type of galaxy known as a blazar, the best explanation for unusual changes in their glow is a pair of supermassive black holes locked in a decaying orbit.
From the far reaches of the observable Universe, astronomers have just seen a supermassive black hole suddenly flare to life.
A survey of the galaxy has revealed hundreds of mysterious cosmic threads pointing towards the supermassive black hole at the heart of the Milky Way. The filaments stretch five to ten light years through space.
Observations of supermassive black holes at the centres of galaxies point to a likely source of dark energy - the "missing" 70% of the Universe.
Australian astronomers have discovered one of the biggest black hole jets in the sky. Spanning more than a million light years from end to end, the jet shoots away from a black hole with enormous energy, and at almost the speed of light.
Scientists have proved that the source of high-energy neutrinos is a special kind of supermassive black holes called blazars.
The international team find that rather than the conventional formation scenarios involving 'normal' matter, supermassive black holes could instead form directly from dark matter in high density regions in the centres of galaxies.
It is thought that the upper mass limit for galactic black holes is around 100 billion solar masses, but new research suggests the mass limit could be much higher - more than a million times greater than the largest galactic black holes.
Astronomers have found six galaxies lying around a supermassive black hole when the Universe was less than a billion years old. This is the first time such a close grouping has been seen so soon after the Big Bang.
The black hole’s mass is about 8,000 times bigger than the black hole in the centre of the Milky Way. If the Milky Way’s black hole wanted to grow that fat, it would have to swallow two thirds of all the stars in our galaxy.