Chapter 33, Problem 1RAT

Summer and winter constellations are different because

(a) of the spin of the Earth about its polar axis.

(b) the night sky faces in opposite directions in summer and winter.

(c) of the tilt of Earth's polar axis.

(d) the universe is symmetric and harmonious.

To determine

The correct option for the statement "Summer and winter constellations are different because".

Answer to Problem 1RAT

The correct option for the statement "Summer and winter constellations are different because" is option (b).

Explanation of Solution

Constellations are the patterns created by a group of stars in the sky. The orbit of the Earth around the Sun changes the constellations seen in different seasons.

The different parts of the Universe are observed due to the orbiting of the Earth around the Sun. The rotation of the Earth is from west to east. Thus, the constellations are seen to move to the west throughout a year. In summer, we look at the night sky in a direction opposite to the direction we look in the winter.

The tilt of the Earth is a constant, and it does not change in different seasons for giving a view of different constellations.

Conclusion:

Therefore, the correct option for the statement "Summer and winter constellations are different because" is option (b).