What's the answer to this question? The light propagates in a straight line and a shadow is formed behind the opaque bodies. This property of light explains:
1. The change of seasons
2. Solar and lunar eclipses
3. Why the moon shines
4. phases of the moon

you can have just about every answer you can think of

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.