Milky Way

Article

January 27, 2022

The Milky Way is a bridging spiral galaxy that houses our Solar System and is a member of the Local Galactic Group within the Virgo Supergate Galaxy. The name "Milky Way" is derived from the appearance of our galaxy seen from Earth into the night sky where you can see a bright band formed of densely arranged stars, which can not be individually distinguished with the naked eye. originated from the Greek name γαλαξίας κύκλος (galaxías kýklos, "milk circle"). Galileo Galilei was the first to distinguish an individual star inside a strip of light with his telescope in 1610. From Earth, the Milky Way looks like a strip, or circumference, because its disk-shaped structure is viewed from the inside. Since the middle of the 18th century, the opinion has been expressed that the appearance of a strip of very densely arranged stars can be explained by the assumption that the Milky Way has a shape similar to the shape of a lens. Until the early 1920s, most astronomers believed that the Milky Way contained all the stars in the universe. It was not until the 20th century, after the Great Debate of 1920 between astronomers Harlow Shepley and Heber Curtis, that Edwin Hubble's observations showed that the Milky Way was just one of many galaxies. The Milky Way is a bridged spiral galaxy with a diameter of between 100,000 and 180,000 light-years. It is estimated that the Milky Way contains 100-400 billion stars. There are probably at least 100 billion planets in the Milky Way. The solar system is located inside the disk, about 26,000 light-years from the galactic center, on the inner perimeter of one of the spiral accumulations of gas and dust called the Orion arm. Stars in the inner ≈10,000 light years form a bulge and one or more arms radiate radially from the bulge. The center itself is marked by an intense radio source, called Sagittarius A, which is probably a supermassive black hole. Stars and gases in a wide range of distances from the galactic center rotate in orbit at a speed of approximately 220 km per second. The constant speed of rotation is in contradiction with the laws of Kepler dynamics, which suggests that a significant part of the mass of the Milky Way does not emit or absorb electromagnetic radiation. This mass is called "dark matter". The rotation period is about 240 million years in the beginning

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