astronomy. how did galaxies get their name
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List of galaxies There is no universal naming convention for galaxies, as they are mostly catalogued before it is established whether the object is or isn't a galaxy. Mostly they are identified by their celestial coordinates together with the name of the observing project (HUDF, SDSS, 3C, CFHQS, NGC/IC, etc.).his is a general list of galaxies, for more specific lists, see lists of galaxies. Size (left) and distance (right) of a few well-known galaxies put to scale. This is an incomplete list that may never be able to satisfy particular standards for completeness. You can help by expanding it with reliably sourced entries.
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Galaxy In the astronomical literature, the capitalized word Galaxy is often used to refer to our galaxy, the Milky Way, to distinguish it from the other galaxies in our universe. The English term Milky Way can be traced back to a story by Chaucer c. 1380:
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Spiral Galaxies The arms of a spiral galaxy have lots of gas and dust, and they are often areas where new stars are constantly forming. The bulge of a spiral galaxy is composed primarily of old, red stars. Very little star formation goes on in the bulge. The table below shows the abbreviations that are used for spiral galaxy types.f you instead see the galaxy from the side, it is called an edge-on spiral.. You can recognize edge-on spiral galaxies because you can see their bright central bulges. Face-on and edge-on spiral galaxies aren't really any different; they only look different because of the angle from which you see them.
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1923: Other galaxies exist 1923: Other galaxies exist. In the early 1900s, astronomers were debating the makeup of spiral nebulae — cloudy, spiral-shaped objects found throughout the night sky. Were they gas clouds located within our Milky Way galaxy, or were they vast groups of stars located far beyond our galaxy? Get to the root of it.
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Number of Galaxies in the Universe An educational, Fair Use website. The universe is made up of many galaxies. When galaxies were first discovered they were called island universes because they looked like islands of stars in a dark sea. New galaxies are discovered every day containing large numbers of stars.
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- TEHRAN (FNA)- A team of astronomers determined that our own Milky Way galaxy is part of a newly identified ginormous supercluster of galaxies, which they have dubbed Laniakea, which means immense heaven in Hawaiian.
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500 Billion --A Universe of Galaxies: Some Older than Milky Way We are seeing them just 600 million years after the Universe's birth in the Big Bang. Galaxy clusters are the largest structures in the Universe, comprising hundreds to thousands of galaxies bound together by gravity.
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The Discovery of Galaxies The Discovery of Galaxies. At the beginning of the 20th century, astronomers believed that our Milky Way was “the universe—except two mavericks who insisted some objects were far beyond the Milky Way and were themselves star systems like ours. One young astronomer using their work two decades later set astronomy on its ear.
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Galaxy Galaxies are categorized according to their visual morphology, including elliptical, spiral, and irregular. Many galaxies are thought to have black holes at their active centers. The Milky Way's central black hole, known as Sagittarius A* , has a mass four million times greater than our own Sun.
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Galaxies SBa galaxies have a short bar of stars extending from the center while SBc galaxies have a long, well-defined bar. Our own Milky Way galaxy is now believed to be a barred spiral galaxy. Elliptical Galaxy - Elliptical galaxies vary in shape from completely round to extremely elongated ovals.
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- The telescope is named after the American astronomer Edwin P. Hubble, who in the 1920's found galaxies beyond our Milky Way and discovered that the universe is uniformly expanding. The heart of the telescope is the 94.5 inch-diameter (2.4-meter) primary mirror.
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- arms, a bulge at its center, and a halo. Spiral galaxies have a variety of shapes and are. classified according to the size of the bulge and the tightness and appearance of the. arms. The spiral arms, which wrap around the bulge, contain numerous young blue. stars and lots of gas and dust. Stars in the bulge tend to be older and redder.
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Structure of the Galaxy The halo stars consist of old, faint, red main sequence stars or old, red giant stars, considered to be among the first stars to have formed in the Galaxy. Their distribution in space and their extremely elongated orbits around the center of the Galaxy suggest that they were formed during one of the Galaxy's initial collapse phases.
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High School Earth Science/Galaxies Compared to your neighborhood, your country, or even planet Earth, the solar system is an extremely big place. But there are even bigger systems in the universe; groups of two, two hundred, or two billion stars! Small groups of stars are called star systems, and somewhat larger groups are called star clusters.There are even larger groups of stars, called galaxies.ur solar system has only one star, the Sun. But many stars—in fact, more than half of the bright stars in our galaxy—are in systems of two or more stars. A system of two stars orbiting each other is called a binary star system. A system with more than two stars is called a multiple star system.
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- The large-scale structure of the Universe is made up of voids and filaments, that can be broken down into superclusters, clusters, galaxy groups, and subsequently into galaxies.At a relatively smaller scale, we know that galaxies are made up of stars and their constituents, our own Solar System being one of them.ue to the limitations of today’s measuring devices, there is a maximum level to which we can zoom out. At that level, we see a universe made up of mainly two components. There are the threadlike structures known as filaments that are made up of isolated galaxies, groups, clusters and superclusters.
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High School Earth Science/Galaxies The biggest groups of stars are called galaxies. Galaxies can contain anywhere from a few million stars to many billions of stars. Every star you can see in the sky is part of the Milky Way Galaxy, the galaxy we live in.ur solar system has only one star, the Sun. But many stars—in fact, more than half of the bright stars in our galaxy—are in systems of two or more stars. A system of two stars orbiting each other is called a binary star system. A system with more than two stars is called a multiple star system.
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Constellation Names Constellation names, like the names of stars, come from a variety of sources and each has a different story and meaning to it. Old constellations’ names usually come from Greek mythology, while the constellations created more recently were mostly named after scientific instruments and exotic animals. However, there are no strict rules because the stories of the constellations differ from one constellation to the next. Constellation names that come from Greek mythology or refer to figures from Greek and Roman myths, as zodiac constellations do, are probably the ones that are best known.
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Spiral galaxy Either way, spiral arms contain many young, blue stars (due to the high mass density and the high rate of star formation), which make the arms so bright. Galactic bulge. A bulge is a huge, tightly packed group of stars. The term commonly refers to the central group of stars found in most spiral galaxies. Using the Hubble classification, the bulge of Sa galaxies is usually composed of Population II stars, that are old, red stars with low metal content.
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Andromeda Galaxy Andromeda Galaxy. The Andromeda Galaxy (/ænˈdrɒmᵻdə/), also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth. It is the nearest major galaxy to the Milky Way and was often referred to as the Great Andromeda Nebula in older texts. It received its name from the area of the sky in which it appears, the constellation of Andromeda, which was named after the mythological princess Andromeda.
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- A galaxy is a massive group of stars, star clusters, interstellar gas and dust, and dark matter which is all gravitationally bound together. The word 'galaxy' is derived from the Greek word galaxias which means milky, it is a reference to our own galaxy the Milky Way.
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The Chemical Composition of Stars and the Universe We think the answer is. 1  all galaxies started out with only hydrogen and helium (so Z = 0) 2  a first generation of stars created helium and heavy elements in their cores, and ejected some into the interstellar clouds. 3  in some galaxies, a second generation of stars has created even more helium and heavy elements.
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Galaxy A galaxy is a group of many stars, along with gas, dust, and dark matter. The name 'galaxy' is taken from the Greek word galaxia meaning milky, a reference to our own galaxy, the Milky Way. Gravity holds galaxies together against the general expansion of the universe. In effect, the expansion of the universe takes place between groups of galaxies, not inside those groups.
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What is a nebula? how does it from a protostar? when does it become a star?? Originally, nebula was a name for any diffuse astronomical object, including galaxies beyond the Milky Way.xamples of these types of nebulae are the Rosette Nebula and the Pelican Nebula. The size of these nebulae, known as HII regions, varies depending on the size of the original cloud of gas. New stars are formed in the nebulae.