Q.11: Name some craters on the Mercury?
Ans: Beethoven, Chopin, Goethe and Ibsen are the craters on the Mercury.

Q.12: What is the average temperature variation on the surface of the Moon?
Ans: The average temperature on the surface of the Moon ranges from 180-degree centigrade to 100-degree centigrade. These extreme temperatures appear because there is no atmosphere around the Moon.

Q.13: Is the Earth closer to the Sun in January or in July?
Ans: The Earth is about three million miles closer to the Sun in January but the seasons are due to the tilt of the axis, the center of the Earth's rotations, and not to our changing distance from the Sun.

Q.14: Which month of the calendar year can lack a new Moon?
Ans: It is February. The interval between successive new Moons is 29 and a half days and there are only 28 days in February 29 in leap year so there might not be a new moon during this month.

Q.15: What will be the colour of the sky if viewed from other planets?
Ans: If you look at the sky from the Moon, it appears completely black because the Moon has no atmosphere. From Mars it appears organic red because the planet is wrapped in a thin atmosphere of carbon dioxide gas.