Milky Way

The Milky Way is a barred spiral galaxy with an estimated visible diameter between 170,000 and 200,000 light-years (ly). It is estimated to contain 100–400 billion stars. It is our local galaxy and it is debated how many arms it has.

Galactic Center
Here radiation will stop Planet from spawning. The Sun is 25,000–28,000 ly (7.7–8.6 kpc) from the Galactic Center.

Galactic Suburbs
Here there is not enough material for Planet to form either.