Phases of the moon occur because

• we can see only that part of the moon which reflects light towards us.

• our distance from the moon keeps changing.

• the shadow of the Earth covers only a part of the moon's surface.

• the thickness of the moon's atmosphere is not constant.

Which of the following is NOT a member of the solar system?

• An asteroid

• A satellite

• A constellation

• A comet

Which of the following is NOT a planet of the sun?

• Sirius

• Mercury

• Saturn

• Earth

The planet which is farthest from the Sun is __________.

The planet which appears reddish in colour is ________.