Question

Age of sun is about:
A. 4.5billion years
B. 45 million years
C. 10 thousand years
D. Hundred thousand years

Answer 1

Hint: Recall the basics about the solar system. It is assumed that the sun and solar system are formed at the same time. Hence, the age of the sun and other planets are also assumed to be the same.

Complete step by step answer:
The sun is a star at the center of the solar system. The age of the sun is approximately 4.5 billion years.

So, the correct answer is “Option A”.

Additional Information:
The sun is at the center of the solar system around which all the planets of the solar system.
The sun is formed from the dust and the rotating gas cloud together named as solar nebula.
The gravitational force of attraction brought all these dust particles and gas cloud together and formed sun with most of the mass at the centre of the sun i.e. the core of the sun.
The age of the sun can be determined from the total energy radiated by the sun in its total life.
The rate of radiation of energy by the sun can be computed with the help of energy that reaches the surface of the Earth and the distance between the sun and the Earth.
Hence, the total energy radiated by the sun in its total lifetime is approximately the product of the age of the sun and the rate at which the sun is radiating energy.
The total lifetime of the sun is estimated to be 10 billion years. Hence, after about 5 billion years, the sun will become a red giant with less temperature of the core and it gets colder the time.

Note:
The age 4.5 billion years of the sun is approximate. According to the different measured ages of the sun, the age of the sun ranges from 4.5 billion years to 4.6 billion years.