Knowledge of the universe part 2

In the last part we talked about the universe in general and matter. In this part we will like to talk more about stars. Not about celebrities, but stars in the universe. Stars are not made of solid matter but of gases, mostly   hydrogen and helium. These gases are what fuels stars to create light and heat energy. 

To us stars look like they are blinking, but when looking them from space their light is constant. It's because Earth is surrounded by air. In air light breaks, a good example of this is when you put a straw in a glass of water it looks like it's broken.

We all know stars are spheres and not shaped as stars, which is kinda ironic. They seem like they are stars because they are shining.