Everything You Should Know About Black Hole!

Explanation
Quartz is the odd one out because it is not related to astronomical concepts like the other options. Event horizon refers to the boundary of a black hole where gravity is so strong that nothing can escape. Accretion disk is a disk of gas and dust that forms around a celestial object, such as a black hole or a young star. Neutron stars are incredibly dense celestial objects that are formed from the remnants of a massive star's core. In contrast, quartz is a mineral commonly found in the Earth's crust and has no direct connection to astronomy.

Explanation
Astronomers discovered black holes. Black holes are astronomical objects that have such strong gravitational pull that nothing, not even light, can escape from them. Astronomers study celestial objects and phenomena, including black holes, using various tools and techniques such as telescopes and space probes. Through their observations and analysis of the behavior of stars and galaxies, astronomers have been able to identify and study black holes, providing valuable insights into the nature of the universe.

Explanation
A black hole exhibits gravitational acceleration. Gravitational acceleration is the acceleration experienced by an object due to the gravitational force exerted by another object. In the case of a black hole, its immense mass creates a gravitational field that causes objects to accelerate towards it at a very high rate. This acceleration becomes stronger as an object gets closer to the black hole, eventually reaching a point where escape becomes impossible, leading to the formation of the event horizon.

Explanation
A black body is characterized by the reflection of no light. This means that when light falls on a black body, it is absorbed completely and no light is reflected back. This is why a black body appears black to our eyes. It is the idealized concept of an object that absorbs all incident electromagnetic radiation, regardless of the wavelength or angle of incidence.

Explanation
The discovery of neutron stars occurred in 1967.

Explanation
A black hole is considered as a mathematical curiosity because its existence and properties are primarily described and understood through mathematical equations and theories. The concept of a black hole emerged from the solutions of Einstein's field equations in general relativity, which are highly mathematical in nature. The mathematical understanding of black holes involves concepts such as spacetime curvature, event horizons, and singularities. Therefore, black holes are seen as fascinating objects that push the boundaries of our mathematical understanding of the universe.

Explanation
In 1958, the concept of a black hole was defined as a region in space where nothing, not even light, can escape its gravitational pull. This definition revolutionized our understanding of the universe and opened up new avenues for studying the behavior of extremely massive objects. Prior to 1958, the idea of a black hole had been theorized, but it was in this year that the term and its characteristics were formally defined.

Explanation
Black holes are not located on any specific celestial body like Mars, the Moon, or Earth. They are found in space, which refers to the vast expanse beyond Earth's atmosphere where all celestial objects exist. Black holes are formed from the remnants of massive stars that have collapsed under their own gravity, creating an extremely dense region in space with a gravitational pull so strong that nothing, not even light, can escape it.

Explanation
David Finkelstein defined black hole as a region of space from which nothing can escape.

Explanation
The correct answer is "Event horizon". The event horizon is the boundary of the region from which no escape is possible, especially in the context of black holes. It is the point of no return, beyond which the gravitational pull is so strong that nothing, not even light, can escape.