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1. a star which is exploded today its light will reach after 100 years as it is 100 light years away from us. 1 light is equal to the distance covered by light in year so 100 light years is equal to distance covered by light in 100 years
2. planets donot collide with each other during their journey because they all have their own orbits
3. the tail of a comet always point away from the sun because the icy materials gets converted into gas vapours due to the heat of the sun and it falls
4. the pole star appears stationary in the sky whereas all other stars appear to move from east to west because pole star is situated near the north pole of earth and it revolves along with the rotation of earth with equal speed
2. planets donot collide with each other during their journey because they all have their own orbits
3. the tail of a comet always point away from the sun because the icy materials gets converted into gas vapours due to the heat of the sun and it falls
4. the pole star appears stationary in the sky whereas all other stars appear to move from east to west because pole star is situated near the north pole of earth and it revolves along with the rotation of earth with equal speed
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