Universe and Big Bang Theory

Q: Why is the Big Bang Theory the most accepted theory for how the universe was formed?

Big Bang Theory is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now. It is the simplest explanation for the origin of the universe which scientists claim is still expanding.

Q: Explain Big Bang theory.

The Big Bang theory is a model to explain the origin of the Universe. According to it, the Universe was created in a massive explosion creating the majority of matter. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now—and it is still stretching.

Q: The branch of science that deals with the study of universe is called:

Astronomy is the branch of science that deals with the study of universe.It deals with observation of celestial objects and study them.

Q: If M is mass of a planet and R is its radius then in order to become black hole [c is speed of light]

According to Einstein \$Ve\ge C\$\$\sqrt { \dfrac { 2GM }{ R } } \ge C\$

Q: Which of the following are examples of celestial objects?

Celestial body or heavenly body is a naturally occurring physical body that can be found outside the Earth's atmosphere. Stars, planets, moon, comets, meteors, asteroids are all classified as celestial bodies.

Q: Two Indian born physicists who have been awarded Nobel Prize in Physics are

C.V. Raman was awarded noble prize for his Raman Effect where as Chandrashekar was awarded for his "Theory of Black Hole".Raman effect is the change in the wavelength of light, when a light beam is deflected by molecules.Black hole is an astronomical cosmic body of extremely intense gravity from which nothing, not even light, can escape.

Q: In which stage of the star, does nuclear fusion reaction begin?

Nuclear fusion reaction begins in the protostar stage in the evolution of star.Fusion in the core of stars is reached when the density and temperature are high enough. There are different fusion cycles that occur in different phases of the life of a star. The first fusion cycle is the fusion of Hydrogen into Helium. This is the stage that our Sun is in.

Q: Answer the following questionWhy was the name black hole given ?

All the light rays falling on black hole gets absorbed. Because of this we cannot see this star at all but can probably see a minute black hole at its place. Thus, the name black hole is given to this star.

Q: Which of the following is not a celestial body of the universe?

Celestial bodies are bodies that exists naturally in the space.Planets and stars are celestial bodies.

Q: Which of the following statement is true for "black hole"?

The temperature of the black hole is inversely proportional to its mass. So, it is also inversely proportional to its density.

Physics

definition

Origin of the Universe

On the basis of the model of supernova explosion of stars that led to the formation of new stars, it is proposed that the universe might have begun with a start of explosion. This is known as the Big Bang theory.

definition

Celestial objects

A celestial body is an object in space having mass. They are usually bound by force of gravitation.
Some examples of celestial objects are sun, moon, stars, etc.

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