The image shows a diagram of the solar system. Which of the following planets is known as the 'Red Planet'?

What is the ratio of the maximum mass of the observable universe to the minimum mass of an electron?

Hubble's law is related to:

There are certain types of stars called variable stars which undergo periodic changes in their light output. If such a star quadruples its light output,how much does its magnitude change?

Smaller pieces of heavy stones and metals which burn out upon entering the Earth's atmosphere are known as:

The length of the Milky Way is .......... light years.