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

So far, so good.

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

Still OK.

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

I knew it was too good to last.

Get an education. Learn some optics.

In general, stars in other galaxies are not resolveable as individual
stars.

Learn some optics.

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

Telescopes.

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

No.

Get an education. Learn some optics. Learn some math.

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

Not a chance.

Get an education. Learn some optics.

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

You mean "our galaxy"?

Simple observation.

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

That's because you are uneducated.

So what are they basis of these assumption?

You mean your assumptions?

Ignorance.

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

The universe doesn't care what you believe.

And Universe is Finite or Infinite is again a Question.

Not to anyone with an education.

Say Universe is Finite then it must have some Shape.

Lets assume it has a Shape of a Sphere.

Then That sphere must have some radius.

Just about right.

What happens about the place outside that sphere.

There is no outside the universe.

Say our Universe Radius is "r"

With a bit of reading you would know that r is currently estimated
to be about 46 billion light years.

Obviously typing "size of the universe" into a Google search is beyond
your capability.

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?

There are no "things" beyond r.

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

There is nothing beyond r.

Get an education.

Universe:

http://en.wikipedia.org/wiki/Universe

Galaxies:

http://en.wikipedia.org/wiki/Galaxy

Our galaxy:

http://en.wikipedia.org/wiki/Milky_Way

Observable universe:

http://en.wikipedia.org/wiki/Observable_universe


--
Jim Pennino

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