What if dark matter is just ordinary matter locked inside black holes – from which, after all, light cannot escape. Such massive, dark objects would trundle around the cosmos, nudging the motion of visible matter while evading direct detection.
If nothing gets out of a black hole, how does gravity do it? Something with virtual gravitons? Is this really necessary? It's tricky question, but this is what I can say without resorting to equations.
Black holes are weird already, but it turns out that the black hole at the centre of the Milky Way Galaxy is a particularly weird one
Black holes were thought to arise from the collapse of dead stars. But a Webb telescope image showing the early universe hints at an alternative pathway.
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On May 12, 2022, astronomers on the Event Horizon Telescope team released an image of a black hole called Sagittarius A* that lies at the center of the Milky Way galaxy. Chris Impey, an astronomer at the University of Arizona, explains how the team got this image and why it is such a big deal.
The biggest reveal in human history: an image of the supermassive black hole, Sagittarius A*, at the center of our Milky Way galaxy.
The public will be invited to lend their own computers to help the scientific community unlock the secrets contained in gravitational waves observed when black holes smash together.
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What it took to collect these 54-million-year-old photons from a supermassive black hole
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