Sky Geometry

A line is defined as a line of points that extends infinitely in two directions.

Parallel lines are two lines that are always the same distance apart and never touch. 

Intersecting lines are two lines that share exactly one point

If two lines are parallel, a line that intersects one of those lines intersects the other one too.

And sometimes, the sky doesn't show you geometry, it just looks like a baby's ultrasound: just as blurry and vague.