For strength. It is made of a number of conductors and reinforcements, each stranded. These are twisted together in the same way as a rope.
First of all, it's a spiral galaxy, not an spiral galaxy. Second, a spiral galaxy would have a spiral shape, obviously.
Spiral
spiral galaxy
Rosalind Franklin discovered the spiral shape of DNA.
A spiral is a geometric shape and as such does not have a 'home'.
The spiral shape of the DNA molecule is called a double helix.
A spiral line in art refers to a curved line that gradually moves away from or towards a central point, creating a spiral shape. This design element can evoke a sense of movement, growth, or dynamism within a composition. Artists often use spiral lines to guide the viewer's eye or to symbolize concepts such as evolution, continuity, or the passage of time. Famous examples include the use of spiral forms in works by artists like Vincent van Gogh and in the architecture of structures like the Fibonacci spiral.
"Spiral" can be a noun as in, "The spring is in the shape of a spiral", or it can be a verb as in, "He would eventually spiral out of control."
spiral shape
Our galaxy is a spiral galaxy because it is spiral in shape.
A spiral is a line, hence its area is zero. For the area of a spiral line of given width, you've moved away from simple math.
The term means to move in a spiral course or shape or in a coiled shape. The spiral is an ancient symbol of seasons and evolution. Each loop is one step higher.