Which theory attempts to explain to us the origin of universe?

Answer

### Step-by-Step Solution:

1. **Identify the Question**: The question asks which theory explains the origin of the universe.

2. **Recall Relevant Theories**: The most widely accepted scientific theory regarding the origin of the universe is the Big Bang theory.

3. **Explain the Big Bang Theory**:
- The Big Bang theory posits that approximately 15 billion years ago, the universe began with a tremendous explosion.
- This explosion marked the beginning of the universe's expansion, where all matter and energy were concentrated at a single point.
- Following this event, the universe began to expand, with particles moving away from each other.

4. **Discuss the Nature of the Event**:
- The Big Bang was not a conventional explosion like a bomb; instead, it involved the expansion of space itself.
- Unlike a bomb that throws fragments outward, the Big Bang filled all of space with particles that rushed away from each other.

5. **Conclude the Answer**: Therefore, the theory that attempts to explain the origin of the universe is the Big Bang theory.

### Final Answer:
The theory that attempts to explain the origin of the universe is the **Big Bang theory**.

---