Stephen Hawking, the 70 year old greatest living physicist of the universe, has identified his biggest mistake. Only Hawking can get away with saying that, strictly speaking, there are no black holes in our universe.
Black holes can be petite, with masses only about 10 times that of our sun -- or monstrous, boasting the equivalent in mass up to 10 billion suns. Do black holes also come in size medium? NASA's Nuclear Spectroscopic Telescope Array, or NuSTAR, is busy scrutinizing a class of black holes that may fall into the proposed medium-sized category.
Throughout our universe, tucked inside galaxies far, far away, giant black holes are pairing up and merging. As the massive bodies dance around each other in close embraces, they send out gravitational waves that ripple space and time themselves, even as the waves pass right through our planet Earth.
A black hole. A simple and clear concept, at least according to the hypothesis by Roy Kerr, who in 1963 proposed a "clean" black hole model, which is the current theoretical paradigm.
NASA's black-hole-hunter spacecraft, the Nuclear Spectroscopic Telescope Array, or NuSTAR, has "bagged" its first 10 supermassive black holes. The mission, which has a mast the length of a school bus, is the first telescope capable of focusing the highest-energy X-ray light into detailed pictures.
Scientists at the University of York say they've dispelled the so-called firewall paradox which suggests that anything falling into a black hole would be burned up as it crossed the event horizon.
Black holes shape the growth and death of the stars around them via powerful gravitational pulses and explosive ejections of energy.
Astronomers believe they've worked out the source of a mysterious burst of gamma rays that irradiated the Earth in the 8th century.
Astronomers have had to come up with a whole new word for black holes that are too big to be described as merely 'supermassive' - and now say there may be a lot more of them around then previously thought.
Scientists at NASA have discovered a new constant that links different sizes of black holes.
In a new twist to string theory, scientists are suggesting that black holes have properties that resemble the dynamics of both solids and liquids.
Astronomers are scratching their heads after discovering not one, but two black holes at the center of a globular star cluster - something they didn't think was possible.
NASA's discovered several million new black holes - along with a thousand or so galaxies obscured by dust - using the Wide-field Infrared Survey Explorer (WISE) telescope.
An international research team has managed to observe the active accretion phase of a supermassive black hole in the center of a galaxy tens of millions of light years away.
Scientists using the Herschel Space Observatory have discovered that galaxies with the most powerful, active black holes at their heart produce fewer stars.
Most galaxies, including our own Milky Way, feature a supermassive black hole at their center weighing millions to billions of suns.
But how do those black holes grow so hefty?
Astronomers have discovered the two largest black holes ever - 10 billion times as massive as our own sun - which look set to consume everything within a region five times the size of our solar system.
In an X-ray image looking further into the past than ever before, NASA astronomers have discovered that massive black holes were common in the early universe and grew much more aggressively than previously thought.
Many giant black holes in the centre of galaxies are spinning faster than at any time in the history of the universe, and may have been set in motion comparatively recently, new research shows.
It should be possible to spot spinning black holes using ground-based telescopes, says a team of astronomers and physicists, because of their twisting effect on spacetime.