The expanse of Akash Ganga is

Options

A. 1 light year
B. 100 light years
C. 10,000 light years
D. 100,000 light years.

Answer

To find the expanse of Akash Ganga, we can follow these steps:

### Step 1: Understand the Concept of a Light Year
A light year is defined as the distance that light travels in one year. Light travels at a speed of approximately 299,792 kilometers per second (or about 186,282 miles per second).

### Step 2: Calculate the Distance of One Light Year
To grasp how far a light year is, we can calculate it:
- One year has about 31,536,000 seconds (60 seconds/minute × 60 minutes/hour × 24 hours/day × 365 days/year).
- Therefore, the distance light travels in one year is:
\[ \text{Distance} = \text{Speed of light} \times \text{Time} \]
\[ \text{Distance} = 299,792 \text{ km/s} \times 31,536,000 \text{ s} \approx 9.46 \text{ trillion kilometers} \text{ (or about 6 trillion miles)} \]

### Step 3: Analyze the Options Given
The question provides four options for the expanse of Akash Ganga:
1. One light year
2. 100 light years
3. 10,000 light years
4. 1 lakh (100,000) light years

### Step 4: Determine the Correct Answer
Based on astronomical observations and studies, the Milky Way galaxy (which includes Akash Ganga) is approximately 100,000 light years in diameter. Therefore, the correct answer is:
- **1 lakh (100,000) light years**.

### Final Answer
The expanse of Akash Ganga is **1 lakh light years**.

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