Q57 of 112 Page 336

State one way in which the planets can be distinguished from the stars in the night sky.

Planets are the members of the Solar System. They look like stars but they do not have light of their own. They reflect the sunlight that fall on them. Whereas the stars emit light of their own. The Sun is also a star.


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55

What are inner planets and outer planets? Name them.

 56

Why is it difficult to observe the planet Mercury?

 58

What are the various environmental conditions available on Earth which are responsible for the existence and continuation of life on Earth?

 59

State one important consequence of each of the following:

(a) Rotation of Earth on its axis.


(b) Motion of tilted Earth around the Sun.