how big is the whole universe ?
       

We can't say coz it has no limit line

No one is sure how big universe is but it is very big.

i am not confirm

i have the answer and the scientist have almost defined here is the answer

We were able to measure that the Universe, if it is curved, has a much larger radius of curvature than that of our observable Universe, which is about 46 billion light years.

The universe is very big consisting of many galaxies and solar system like us, there are very big stars in the whole universe and the answer to your question we shall never know. You can consider the whole space as universe.

Regards,
Raj Harshit,
Nirmal Bhartia School.

I am suggesting you one thing. Go to google and type "the answer to life and the whole universe? " and press "I am feeling lucky" you will get your answer which is 49. Try this once.

Regards,
Raj Harshit.

Let me tell you one thing study the Big Bang Theory.

google

sss

The Big bang Theory