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This is a list of galaxies that are visible to the naked eye, for at the very least, keen-eyed observers in a very dark-sky environment that is high in altitude, during clear and stable weather.
List of galaxy groups and clusters; List of galaxy superclusters; List of filaments of galaxies
A galaxy is any of the systems of stars and interstellar matter that make up the universe. Many such assemblages are so enormous that they contain hundreds of billions of stars. Galaxy clusters are gravitationally bound groupings of galaxies, numbering from the hundreds to the tens of thousands.
List of galaxies and galaxy clusters. Because there are so many galaxies in the universe, this list has been divided into several categories. The first catalog that catalogues galaxies is the Catalogue of Galaxies and of Clusters of Galaxies.
100 Notable Galaxies. An A-to-Z list of 100 notable galaxies of the night sky. Dim, diffuse objects like galaxies require lots of telescope aperture and are ideal for viewing with a dobsonian telescope. Also see the Local Group of Galaxies.
Types of Galaxies Scientists sometimes categorize galaxies based on their shapes and physical features. Other classifications organize galaxies by the activity in their central regions – powered by a supersized black hole – and the angle at which we view them.
Galaxies consist of stars, planets, and vast clouds of gas and dust, all bound together by gravity. The largest contain trillions of stars and can be more than a million light-years across. The smallest can contain a few thousand stars and span just a few hundred light-years.
The existence of galaxies was not recognized until the early 20th century. Since then, however, galaxies have become one of the focal points of astronomical investigation. The notable developments and achievements in the study of galaxies are surveyed here.
Galaxies, averaging an estimated 100 million stars, [3] range in size from dwarfs with less than a thousand stars, [4] to the largest galaxies known – supergiants with one hundred trillion stars, each orbiting its galaxy's center of mass.
Astronomers classify galaxies into three major categories: elliptical, spiral and irregular. These galaxies span a wide range of sizes, from dwarf galaxies containing as few as 100 million stars to giant galaxies with more than a trillion stars.