Our Galaxy, sometimes called the Milky Way Galaxy, belongs to spiral galaxies. It has the shape of a convex lens with a diameter of about 30 kpc (according to some sources, 24.5 kpc) and a thickness of about 4 kpc. The galaxy is spinning. The Sun makes a complete revolution around the center of the Galaxy in 200 – 250 million years. The galaxy also has a spherical halo with a radius of at least 20 kpc.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.