Q20 of 25 Page 101

Fig. 17.6 shows comets without their tail. Show the tails of the comets at position A, B, and C. In which position will the tail be longest?


A heavenly body consisting mainly of ice, dust and gas revolving in an orbit and when it comes near the Sun, a tail produced of dust and gas can be observed pointing away from the Sun. Comets are sometimes also referred to as "dirty snowballs".

The tail of the comets are visible only when it passes through the inner orbit of solar system and 'B' being the closest point from the Sun, will have the longest tail.



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Paheli saw the moon through a glass window at 8:00 p.m. She marked the position of the moon on the glass pane. She got up at 4 a.m. in the morning. Will the moon be visible at the same position?

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Suppose the moon emits light of its own. Would it still have phases? Justify your answer.

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Explain why we always see the same side of moon.

 22

Look at Fig. 17.7 carefully and answer the following question:

(a) In which part of the sky would you see the full moon in the evening?


(b) In which part of the sky would you see the crescent moon in the evening?