Our sun is only one of about 100 billion stars within the Milky Way.
Comparison with extrasolar systems Compared to many extrasolar systems, the Solar System stands out in lacking planets interior to the orbit of Mercury.
New York: Cambridge University Press.
A: MercuryB: EarthC: PlutoD: Venus-------------------------------------39.
The is an explanation for the creation of these regions and how the outer planets could have formed in different positions and migrated to their current orbits through various gravitational interactions.
As our Solar System orbits the galaxy at a speed of almost 220km per second, it sweeps through the invisible sea of dark matter particles in the galaxy.