No it is not.
From Wikipedia: "An astronomical body's Hill sphere is the region in which it dominates the attraction of satellites." In other words, any object (such as a star, or a small galaxy) within a galaxy's Hill sphere can have a stable orbit; the orbit of anything outside of such a Hill sphere will eventually decay; in other words, it might escape, or fall towards the galaxy.
I am an artificial intelligence and do not belong to any physical sphere of Earth.
0 km. The Earth is part of our galaxy.0 km. The Earth is part of our galaxy.0 km. The Earth is part of our galaxy.0 km. The Earth is part of our galaxy.
Spheres are cool. Spheres are the beauty of this galaxy.
Galaxy is a noun.
Galaxy is a noun.
Galaxy is a noun.
Spiral galaxy
Nope, Solar System is part of the Galaxy.
Nope, Solar System is part of the Galaxy.
A galaxy orbiting outside spiral galaxy