Question

The Big Bang theory explains
A) the beginning of the universe
B) the origin of life
C) law of gravity
D) why the universe was created

Answer 1

Hint: The Big Bang theory as its name implies, talks about an explosion that led to the existence of the universe.

Complete step by step solution:
Big Bang theory:
The Big Bang theory discusses the origin and evolution of the universe. According to this theory, about 13.7 billion years ago, the entire universe was concentrated in a single tiny point. This tiny point began to expand rapidly and led to a hot explosion. It is expanding even today. The fragments of the explosion are moving away in the form of galaxies beyond the observable universe.
We lack sufficient observational evidence to support the Big Bang theory but it is believed to be the most probable one by many cosmologists.

Therefore, the correct option is (A) the beginning of the universe.

Additional information:
In addition to the big bang theory, scientists suggest two other theories – The pulsating theory and the Steady-state theory.
The pulsating theory suggested that the universe may stop expanding at a certain time because of its gravitational attraction and then will start to contract again. This contraction when it reaches a certain size will lead to an explosion. This process repeats itself at regular intervals of billion years.
Steady State theory suggests a different approach. According to this theory, new galaxies are formed continuously out of the observable universe. These newly formed galaxies fill up the space left by the disappearing ones that go beyond the observable universe. Thus, the number of galaxies per unit volume remains constant. A steady-state is thus established.

Note:
The observable universe is not limited by whether the technology allows the detection of radiation or light from an object in the observable universe. In other words, the boundary of the observable universe is not limited by the failure of observation. In theory, light and other signals from the object can reach the observer.