Sanny wrote:
When I see sky I only see small stars twinkling at night.

Now When I see sky with a large telescope I will again see many stars.

How do I know whether a twinkling Object is a Star from our Galxy or
it is some other Galaxy.

How do scientist see the very far away Galaxies and see Billions of
Stars in it.

Can they really see each star in the Galaxy and how do they count that
there are 100 Billion stars in that galaxy.

It may happen That is just a Star with a Billions of small planet
sized things.

And when we are living inside the Galaxy how do astronomers descide
that our galaxy is spiral.

As far as I know whichever direction I see I can see infinite number
of stars.

So what are they basis of these assumption?

What I bilieve is stars are randomly distributed throughout the
Universe.

And Universe is Finite or Infinite is again a Question.

Say Universe is Finite then it must have some Shape.

Lets assume it has a Shape of a Sphere.

Then That sphere m ust have some radius.

What happens about the place outside that sphere.

Say our Universe Radius is "r"

What are the things ar a distance 2r, 3r, 100r, 1000r. Why do we not
consider the things at a distance 1000r as part of our Universe?

Why we confine our Universe to be a Sphere of radius r ????

Bye
Sanny