Question

According to Stephen Hawking’s black hole theory, the area of black hole’s event horizons should never shrink. This theory reinforced a series of fundamental insights about black hole mechanics.This black hole law predicted by Stephen Hawking was quite similar to the second law of thermodynamics-the entropy, or degree of disorder within an object, should also never decrease.

The similarity in both theories suggested that black holes could behave as thermal, heat-emitting objects. In 1974, Hawking showed that black holes could have entropy- if considering their quantum effects, black holes can radiate for very long timescales.

Scientists dubbed this phenomenon Hawking radiation.

It all begins with Stephen Hawking’s theory on black holes: the total area of the black hole event horizon can never go down.

However, this area theorem works out mathematically, but scientists had not found any way to detect it against nature until LIGO’s first detection of gravitational waves.

At the time, researchers could not pick out the necessary information within the signal, before and after the merger, to determine whether the final horizon area did not decrease, as Hawking’s theorem would assume.

In 2019, Maximiliano Isi, a NASA Einstein Postdoctoral Fellow in MIT’s Kavli Institute for Astrophysics and Space Research, and his colleague developed a technique to extract the reverberations immediately following GW150914’s peak — the moment when the two-parent black holes collided to form a new black hole.

Now, almost fifty years later, physicists at MIT and elsewhere have now confirmed Hawking’s area theorem for the first time. They took a closer look at GW150914, the first gravitational wave signal detected by the Laser Interferometer Gravitational-wave Observatory (LIGO), in 2015​

Answer 1

Answer: According to Stephen Hawking's black hole theory, the area of black hole's event horizons should never shrink. ... In 1974, Hawking showed that black holes could have entropy- if considering their quantum effects, black holes can radiate for very long timescales. Scientists dubbed this phenomenon Hawking radiation

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Answer 2

Explanation:

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