Describe the structure of our Galaxy. Where is our star located in the Galaxy?

The dimensions of the Galaxy: the diameter of the Galaxy’s disk is about 30 kpc (100,000 light years), the thickness is about 1,000 light years. The Sun is located very far from the core of the Galaxy – at a distance of 8 kpc (about 26,000 light years). The galaxy consists of a disk, a halo and a corona. The central, most compact region of the Galaxy is called the nucleus. There is a high concentration of stars in the core: there are thousands of stars in each cubic parsec. If we lived on a planet near a star located near the core of the Galaxy, then dozens of stars would be visible in the sky, comparable in brightness to the Moon. At the center of the Galaxy, a massive black hole is assumed. The galaxy contains two main subsystems (two components), nested one into the other and gravitationally connected with each other. The first is called spherical – halo; its stars are concentrated towards the center of the Galaxy, and the density of matter, which is high in the center of the Galaxy, decreases rather rapidly with distance from it. The central, densest part of the halo within a few thousand light years of the galactic center is called the bulge. The second subsystem is a massive stellar disk. It looks like two plates folded by the edges. The concentration of stars in the disk is much higher than in the halo. The stars inside the disk move in circular paths around the center of the Galaxy. The sun is located in the stellar disk between the spiral arms.

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