A star is 20 light years from the Earth. How much time does it take for the light from the star to reach the Earth ?

Options

A. 60 years
B. 20 years
C. 6 years
D. 15 years

Explanation

To solve the problem of how much time it takes for light from a star that is 20 light years away to reach Earth, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Light Year**:
- A light year is defined as the distance that light travels in one year.

2. **Distance to the Star**:
- The problem states that the star is 20 light years away from Earth.

3. **Calculating Time**:
- Since 1 light year is the distance light travels in 1 year, if the star is 20 light years away, it means that light from that star takes 20 years to reach Earth.

4. **Conclusion**:
- Therefore, the time taken for the light from the star to reach Earth is **20 years**.

### Final Answer:
The light from the star takes **20 years** to reach Earth.

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