The "shiny middle part" of the Milky Way Galaxy refers to its central region, which is known as the Galactic Center or Galactic Bulge. The Galactic Center is a dense and luminous area located in the core of the Milky Way.
At the center of the Galactic Bulge lies a supermassive black hole called Sagittarius A* (Sgr A*). This black hole has a mass equivalent to millions of times that of our Sun. The gravitational pull of Sgr A* affects the surrounding stars and gas, causing them to orbit around it.
The Galactic Bulge is rich in stars, dust, and gas, which contribute to its brightness. It contains a high concentration of stars, including older stars that are part of the galaxy's stellar population. The presence of dust and gas also contributes to the obscuration of light and the creation of dark lanes within the Galactic Center.
Observing the Galactic Center is challenging from Earth due to the presence of interstellar dust, which blocks much of the visible light. However, using other wavelengths such as infrared, radio, and X-rays, astronomers have been able to study the Galactic Center in greater detail and gain insights into the dynamics and structure of the region.
It's worth noting that the appearance of the Galactic Center can vary depending on the perspective and the specific observations made. Images and visualizations of the Milky Way's central region often reveal a bright and intricate mix of stars, gas, and dust, highlighting the dynamic nature of our galaxy's core.