How many galaxies exist? Detailed answer

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How many galaxies exist? Detailed answer

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How many galaxies exist?

Scattered throughout the universe, there are huge collections of stars called galaxies. Our Sun is a star in the Milky Way galaxy, which is made up of billions of stars. It takes about a hundred thousand years for light from one end of our galaxy to reach the other (and light travels at 9 kilometers a year!) Astronomers have discovered with telescopes that there are millions more galaxies besides ours. Basically, there are 000 types of galaxies known to us. Those that are spiral in shape, like our Milky Way, are called spiral galaxies.

The nearest of them is located at a distance of about two million light years from us. It is a huge spiral galaxy in the constellation Andromeda. About 17 percent of the brightest observed galaxies are elliptical galaxies (an ellipse looks like an elongated circle). These galaxies are made up mostly of stars and seem to have little or no gas and dust.

Some galaxies are called irregular because they do not have a specific shape. These galaxies are made up of stars, dust, and gas. The two closest galaxies to the Milky Way are irregular galaxies. There are also several small galaxies called "dwarfs". The smallest of them are only a few hundred light-years across and formed by only a few thousand stars. There may be many more "dwarfs" in the Universe than large galaxies.

The galaxies are separated from each other by hundreds of thousands of light years. They usually exist in groups, or clusters, containing from several tens to many thousands of galaxies. The most distant galaxy clusters that can be observed are trillions of light-years from our Milky Way. There are galaxies that are so far from us that it is simply difficult to imagine the vastness of the distance to them. Therefore, the answer to the question: "How many galaxies are there in the Universe?" - will probably always remain a mystery.

Author: Likum A.

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