Out of following which statement is incorrect ?

Options

A. The universe is almost 20 billion years old
B. Earth was supposed to have been formed about `4.5` billion years back
C. Life appeared 500 million years after the formation of earth
D. The Big Bang Theory erxplain the origin of earth

Answer

To determine which statement is incorrect, let's analyze each statement provided in the question step by step:

1. **Statement 1**: "The universe is almost 20 billion years old."
- The current scientific consensus is that the universe is approximately 13.8 billion years old, according to the Big Bang Theory. Therefore, this statement is incorrect.

2. **Statement 2**: "Earth was supposed to have been formed about 4.5 billion years back."
- This statement is correct. Scientific evidence supports that Earth formed around 4.5 billion years ago.

3. **Statement 3**: "Life appeared 500 million years after the formation of Earth."
- This statement is also correct. Life is believed to have appeared approximately 3.5 billion years ago, which is around 500 million years after Earth's formation.

4. **Statement 4**: "The Big Bang Theory explains the origin of Earth."
- This statement is misleading. The Big Bang Theory explains the origin of the universe, not specifically the origin of Earth. Earth formed later from the remnants of the solar nebula.

Based on this analysis, the incorrect statement is:

**Final Answer**: The first statement is incorrect: "The universe is almost 20 billion years old."