Q. Which of the following theory states that the universe began to cool down sufficiently in order to allow the formation of particles that would later become atoms after its initial phase of expansion?
Answer: A
Notes:
Explanation: The Big Bang Theory states that the universe began to cool down sufficiently in order to allow the formation of particles that would later become atoms after its initial phase of expansion.
- Primordial elements – Hydrogen, Helium, and Lithium – condensed through gravity that formed early stars and galaxies.
- In simpler terms, it can be stated that the universe inflated into the cosmic system 13.8 billion years ago to form the galaxy and the solar system as we know it.
Source: NCERT – Fundamental of Physical Geography
