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Do black holes exist and, if not, what have we really been looking at?

Space

Do black holes exist and, if not, what have we really been looking at?

Black holes are so strange that physicists have long wondered if they are quite what they seem. Now we are set to find out if they are instead gravastars, fuzzballs or something else entirely

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2G4A579 3D visualization of gravity distorsion, physical objects in orbit, space, general theory of relativity, law of universal gravitation, scientific

Physics

Why I still love reckoning with the quantum gravity problem

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The wild physics that could actually be used to build a time machine

Physics

The wild physics that could actually be used to build a time machine

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Space

Einstein’s theories tested on the largest scale ever – he was right

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Simulation of a black hole

Space

What does it mean to “look” at a black hole?

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This photograph shows the Submillimeter Telescope (SMT) at the Arizona Radio Observatory, at an altitude of 3100 metres on Mount Graham in Arizona, USA. https://www.eso.org/public/unitedkingdom/images/eso1229d/?lang

Space

The physicist who wants to build a telescope bigger than Earth

Features

How a simple physics experiment could reveal the “dark dimension”

Physics

How a simple physics experiment could reveal the “dark dimension”

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Space

Time ticks faster on the moon by 57 microseconds per Earth day

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Space

Einstein's theory was wrong about black holes made out of light

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Black hole in deep space

Space

Einstein was right about the way matter plunges into black holes

For the first time, astronomers have observed the area right at the edge of a black hole where matter stops orbiting and plunges straight in at near light speed

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Space

We are about to hear echoes in the fabric of space for the first time

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Space

We live in a cosmic void so empty that it breaks the laws of cosmology

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Physics

Einstein may be wrong about how mirrors travelling at light speed work

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Space

A legendary cosmologist on how to find a deeper theory of the universe

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