ABHIMANYU DAHIYA

Chapter 1 - The Earth in the Solar System Q.1: Answer the following questions briefly. (a) How does a planet differ from a star? (b) What is meant by the ‘Solar System’? (c) Name all the planets according to their distance from the sun. (d) Why is the Earth called a unique planet? (e) Why do we see only one side of the moon always? (f) What is the Universe ? Ans : (a) Stars are big and hot celestial bodies made up of gases. They have their own heat and light, which they emit in large amounts. Planets are also celestial bodies, but they do not have their own heat and light. They are lit by the light of stars. (b) The Sun, eight planets, satellites and some other celestial bodies known as asteroids and meteoroids form the solar system. (c) In order of their distance from the sun, the eight planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. (d) Conditions favorable to support life are probably present only on Earth. The Earth is neither too hot nor too cold...