Seeing a line rather than a dot when looking through refracting telescope
First off I want to say I am a complete amateur when it comes to stars and even bigger when it comes to optics.

I was looking at sky from indoors and my windows have double glass. It turns out that this was the problem or maybe the glass on the window is not some good quality.

In any case, all works well now and I am thrilled at what I'm seeing in the night sky.