The protective blanket of earth which absorbs ultraviolet radiations coming from the sun

All the eight planets of the solar system revolve around the sun in elliptical paths known as 

Which celestial bodies produce their own heat and light.

All the objects in the sky are called 

What is also called the universe ? 

What is the center of the solar system called? 

The word 'planet' is derived from a /an ___________ word.

The Earth's shape is best described as: