Question

Stars appear to be permanent to us even though these are born, grow and then die because

• A. They are situated at the northern tip of the earth's axis of rotation.
• B. Physical characteristics of star change very slowly with time.
• C. They do not have their own light.
• D. None of these.

Answer 1

The correct option is B

Physical characteristics of star change very slowly with time.

Stars appear to be permanent because the physical characteristics of the star like brightness, temperature, colour and size change very slowly with time as compared to our life span. It takes millions of years for a noticeable change to occur in a star whereas man stays on earth for 70-75 years on an average.