NCERT Class VIII Science Solutions: Chapter 17-Stars and the Solar System Part 6

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Question 23:

Write the names of all planets in Fig.

As showing in fig is a names of all planets (Q)

Names of All Planets (Q)

As showing in fig is a names of all planets (Q)

Answer:

As showing in fig is a names of all planets (A)

Names of All Planets (A)

As showing in fig is a names of all planets (A)

Question 24:

Suppose the distance between earth and sun becomes half of its present distance. What is likely to happen to life?

Answer:

Life may no longer exist because some special environmental conditions are needed for the existence and continuation of life on the earth. The right distance of earth from the Sun is necessary so that it has right temperature range, the presence of water and suitable atmosphere and a blanket of ozone.

Question 25:

Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major).

Answer:

Locate the two end stars of Ursa Major. Imagine a straight line passing through these stars as shown in the figure below. Extend this imaginary line towards the north direction. This line will lead to a star which is not too bright. This is pole star.

As showing in fig is a Ursa Major and Pole Star

Ursa Major and Pole Star

As showing in fig is a Ursa Major and Pole Star