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Modelling black holes in the laboratory. a, An astrophysical black hole is characterized by an extremely warped region of space-time. In the 1970s, Stephen Hawking studied1 what happens when a pair of particles is produced from the vacuum of space near a black hole’s event horizon — the boundary beyond which nothing can escape. He found that one of the particles would be absorbed by the black hole, and the other would be emitted into space in the form of thermal radiation, which is now called Hawking radiation. b, de Nova et al.3 report observations of an analogue black hole, which is based on a flowing fluid of ultracold atoms. One region of the fluid travels at a supersonic speed and a connected region travels at a subsonic speed; sizes of grey arrows indicate speed. The boundary between these regions provides an analogue black-hole event horizon. When a pair of sound waves is produced near this boundary, one of the waves is absorbed into the supersonic region, and the other is emitted away from the region in the form of Hawking radiation.

In an experiment, scientists made an analogue black hole that traps sound

Space
The entropy of a black hole and Hawking radiation should have the same temperature given by the surface gravity, within a numerical factor of...
Stephen Hawking: "I Am Convinced That Humans Need to Leave Earth For Prolong Humanity's Existence"

Stephen Hawking: “I Am Convinced That Humans Need to Leave Earth For Prolong Humanity’s...

Science
Recently in May, Stephen Hawking made a prediction that humanity has 100 years left on Earth. But, now he estimates that the only way...
A Gas Station in Space Could Allow Us to Reach Other Worlds

A Gas Station in Space Could Allow Us to Reach Other Worlds

Space
It has been almost 45 years that a human set foot on the moon. Every year, students from a wide range of backgrounds are invited...
Stephen Hawking: Humanity only has around 1,00 years left on Earth

Stephen Hawking: Humanity Only Has Around 100 Years Left On Earth

Inspiration
Since the century or so, humanity has cultivated a great deal of innovation from airplanes to the smart devices. But, at the same time,...

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