Why does not an aeroplane or a bird cast a shadow when they are at greater heights?

Explanation

To understand why an aeroplane or a bird does not cast a shadow when they are at greater heights, we can break down the explanation into a few clear steps:

### Step-by-Step Solution:

1. **Understanding Light and Shadows**:
- Shadows are formed when an object blocks light from a source, such as the Sun. The area behind the object where the light cannot reach becomes the shadow.

2. **Position of the Object**:
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