Name the theory that explained the origin of universe. What are the salient features of the theory?

Explanation

### Step-by-Step Solution:

1. **Identify the Theory**: The theory that explains the origin of the universe is known as the **Big Bang Theory**.

2. **Explain the Concept**: The Big Bang Theory posits that the universe originated from a massive explosion of cosmic material. This explosion marked the beginning of the universe as we know it.

3. **Formation of Elements**: Following the explosion, the primary outcome was the formation of hydrogen and other light nuclei. This process is crucial as it laid the foundation for the creation of more complex elements.

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