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Chapter 17 Stars and the Solar System Solutions

Question - 11 : -
Name two objects other than planets which are members of the solar system.

Answer - 11 : -

Comets, asteroids.

Question - 12 : -
Explain how you can locate the Pole Star with the help of Ursa Major.

Answer - 12 : -

Pole star can be located with the help of the two stars at the end of Ursa Major. Imagine a straight line passing through these stars as shown in Fig. 17.2. Extend this imaginary line towards the north direction. (About five times the distance between the two stars). This line will lead to a star which is not too bright. This is the Pole Star.

Question - 13 : -
Do all the stars in the sky move? Explain.

Answer - 13 : -

No, stars actually do not move but they only appear to move from east to west, as the Earth from where we see them, rotates from west to east. However pole star, which is situated in the direction of the Earth’s axis, does not appear to move.

Question - 14 : -
Why is the distance between stars expressed in light years? What do you understand by the statement that a star is eight light years away from the Earth?

Answer - 14 : -

The Sun is nearly 150,000,000 kilometres (150 million km) away from the Earth.

The next nearest star to the Earth after the Sun is Alpha Centauri. It is at a distance of about 40,000,000,000,000 km from the Earth. Some stars are even more farther away. It is not convenient to express such distances in kilometres.

Such large distances are expressed in another unit known as light year. One light year is the distance travelled by light in one year.

If we say that a star is eight light years away from Earth, it means that the light from that star will reach the Earth in eight years.

Question - 15 : -
The radius of Jupiter is 11 times the radius of the Earth. Calculate the ratio of the volumes of Jupiter and the Earth. How many Earths can Jupiter accommodate?

Answer - 15 : -

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