Because they can see it.
The Milky Way is a vast collection of stars. It has no surface.
because it looks like a spiral
milky, like a river of stars
milky way
Well technically speaking they don't know what it looks exactly like its just an estimate I on what it looks like I mean you could dig your entire life and not even get through the athenoshpere
No there isn't because we actually dont know what our galaxy looks like.
it looks like they have a greyish milky pupil
Most commonly, this galaxy is called the Milky Way. It is a lenticular galaxy, and is known by our scientist to have carbon based life forms. Other life forms are yet to be discovered by these carbon based life forms.
Well the shape looks a lot like a circle spiral...
Theoretically, scientist do not know what the sun looks like through this perspective. The only way to know is to actually be there. However, research using inductive and deductive empirical reasoning to make accurate assumptions.
Water Vapor is invisible only scientist may figure that out. If you have a science or something just say: Water Vapor is invisible you don't really know how it looks.
The Milky Way is not a place you can be on, it is our galaxy which we are part of. From earth it looks like a milky white band across the sky (thus the name).