Big Bang theory explains the origin of

Options

A. (a) universe
B. (b) solar system
C. (c) earth
D. (d) stars

Answer

### Step-by-Step Text Solution:

1. **Understanding the Big Bang Theory**: The Big Bang theory is a cosmological model that explains the early development of the universe. It suggests that the universe began from a very hot, dense state and has been expanding ever since.

2. **Initial Conditions**: According to the theory, the universe started as a singularity, a point of infinite density and temperature. This singularity exploded, leading to the rapid expansion of space.

3. **Formation of Stars and Galaxies**: After the initial explosion, the universe cooled down, allowing matter to form. Within a few hundred million years, the first stars began to form. Over time, these stars grouped together to form galaxies.

4. **Development of the Solar System**: As the universe continued to expand and cool, stars evolved and some of them formed planetary systems. Our solar system formed about 9 billion years after the Big Bang.

5. **Origin of Life**: Earth, one of the planets formed in our solar system, had conditions suitable for life, including the presence of water and an atmosphere rich in oxygen. Life is believed to have originated in the water.

6. **Historical Context**: The Big Bang theory was first proposed by Georges Lemaître in the 1920s. Later, scientists like Edwin Hubble provided observational evidence supporting the theory by studying the movement of galaxies.

7. **Conclusion**: The Big Bang theory explains the origin of the universe, detailing how it evolved from a singularity to the vast cosmos we observe today.