Question

Give Reason: Stars twinkle but planets do not twinkle.​

Answer 1

Answer:

Stars twinkle but planets do not twinkle.

Explanation:

1. Planets do not twinkle.

2. Planets are so closer to the earth.

3. Stars are so far from the earth.

4. As stars are so far from the earth, they appear like a point source.

5. But, planets do not appear like a point source. They appear like a collection of many point sources.

6. The refractive index of atmosphere does not remain constant.

7. As a result of this, the brightness of a point source ( stars ) changes.

8. But, the brightness of the collection of point sources ( planets ) does not change.

Hence, stars twinkle but planets do not twinkle.

Additional Information:

1. Refraction of light:

When a light ray travels from one medium to another which is transparent in nature, the light ray changes its path. This process is known as refraction of light.

2. Atmospheric Refraction:

When light from the sun enters earth's atmosphere, it changes its path due to change in medium. This is called as atmospheric refraction.

3. Twinkling of Stars:

1. It is an effect of atmospheric refraction.

2. Stars have their own light ( self luminous ) and are so far from the earth.

3. They appear as point source and can be seen twinkling in the absence of sunlight i. e. in night.

Answer 2

Answer:

1: Stars twinkle, but planets do not.

Our sun is the nearest star. Stars are farther away from us than planets, the light from stars passes through various layers with different temperatures. So due to diffraction of light, stars seem to twinkle, they appear only as pinpoints. and planets do not.

Explanation:

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