In the last article, we have understood the concept of “Entropy.” In this article, let us understand the concept of the Information paradox

One of the unsolved mystery in science is the “Black Hole Information Paradox.” To understand this, we need to understand a few terms of physics.

**Quantum Physics:** Quantum physics is the study of matter and energy at its most fundamental level. To know more on quantum physics, click here.

**Black Holes:** A black hole is a region of spacetime where gravity is so strong that nothing, no particles or even light can escape. To know more on black holes, click here.

**Event Horizon:** It is the boundary surrounding the region of space of a black hole from which nothing (not even light) can escape.

**Hawking’s Radiation**: It is thermal radiation black holes emit, due to quantum effects near the event horizon.

As we all know, everything in this universe is made of matter. If we divide matter into the smallest particles we get subatomic particles. They are the building blocks of everything in this universe.

Let us take an object, for example, any flammable substance. No matter how much you burn it, the quantum level of the substance remains the same in the universe. It stays in some or the other form.

There is a vital law of physics here ” The total amount of quantum information in the universe must be conserved.” Theoretically, knowledge of that information will help us recreate the substance again.

When an object falls into the black hole, it seems that it leaves the universe.

The object might be in the black hole. Theoretical proofs suggest that the objects quantum information might be present in the event horizon of the black hole. As the black holes’ mass increases by taking in the objects, the area of the black hole. Therefore the event horizon increases.

According to Hawking’s radiation, black holes evaporate gradually over time. Black holes loose mass, as they discard particles from the event horizon. Hawkings radiation shows that the particles that come out from the event horizon are not the same that has entered.

As the black hole evaporates completely, we do not have any information on the particles that have entered the black hole. This is the information paradox of black hole. Till now there is no exact proof for this paradox.

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