what are the characteristics of stars in the disk of a spiral galaxy?
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Most spiral galaxies contain a central bulge surrounded by a flat, rotating disk of stars. The bulge in the center is made up of older, dimmer stars, and is thought to contain a supermassive black hole. Approximately two-thirds of spiral galaxies also contain a bar structure through their center, as does the Milky Way.
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A spiral galaxy like the Milky Way has three basic components to its visible matter: the disk (containing the spiral arms), the halo, and the nucleus or central bulge.
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A star can be defined by five basic characteristics: brightness, color, surface temperature, size and mass.
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No, not all stars are in a galaxy. They may have once belonged to a galaxy, but they are not a part of it any more. Some of these so-called "stellar outcasts" or "intergalactic stars" have actually been observed by NASA's Hubble Space Telescope. ... We can observe their motion, and the motion of any nearby galaxies.
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type of galaxy divided into two parallel classes: normal spirals and barred spirals. The normal spirals have arms that emanate from the nucleus, while barred spirals have a bright linear feature called a bar that straddles the nucleus, with the arms unwinding from the ends of the bar. The nucleus of a spiral…
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Population I stars Population I, or metal-rich, stars are young stars with the highest metallicity out of all three populations, and are more commonly found in the spiral arms of the Milky Way galaxy.
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Galaxy classification There are three general types: elliptical, spiral, and irregular. Perhaps the most familiar kind of galaxy are spiral galaxies.
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What is the difference between a galaxy and a star? While galaxies are massive systems made up of stars, dust, and gas clouds, stars are big, gaseous bodies that undergo nuclear reactions and emit light.
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['Elliptical galaxy: dwarf elliptical galaxy (dE)', 'Dwarf spheroidal galaxy (dSph): Once a subtype of dwarf ellipticals, now regarded as a distinct type.', 'Irregular galaxy: dwarf irregular galaxy (dIrr)', 'Spiral galaxy: dwarf spiral galaxy (dS)', 'Magellanic type dwarfs.', 'Blue compact dwarf galaxies (see section below)']
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Astronomers classify stars according to their physical characteristics. Characteristics used to classify stars include color, temperature, size, composition, and brightness. ... Astronomers use spectrographs to determine the elements found in stars.
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Answer is by studying the density of neutral and ionized hydrogen as well as the rotational motion of stars. These studies shows that the Milky Way is a barrel spiral galaxy. We can also take top-down images of nearby galaxies, like the Andromeda Galaxy (M31), NGC 3344 , and the Whirlpool Galaxy (M51).
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The Milky Way is a large barred spiral galaxy. All the stars we see in the night sky are in our own Milky Way Galaxy. Our galaxy is called the Milky Way because it appears as a milky band of light in the sky when you see it in a really dark area.
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Explanation: A Seyfert galaxy is a spiral galaxy with an active nucleus. ... Type I Seyfert galaxies are very bright sources of visible and ultraviolet light and x-rays. Type II Seyfert galaxies are very bright sources of infra-red and visible light.
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Spiral galaxies have three main components: a bulge, disk, and halo (see right). The bulge is a spherical structure found in the center of the galaxy. This feature mostly contains older stars. The disk is made up of dust, gas, and younger stars.
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Galaxies are disc shaped because they are gas rich and dynamically young. Stars are also gas rich but they are dynamically old so they have had time to rid themselves of their discs. Young protostars (which are dynamically young) are surrounded by proto-stellar discs.
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No, not all stars are in a galaxy. They may have once belonged to a galaxy, but they are not a part of it any more. Some of these so-called "stellar outcasts" or "intergalactic stars" have actually been observed by NASA's Hubble Space Telescope. ... In other words, they are truly "intergalactic", or between galaxies.
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The Milky Way is a large barred spiral galaxy. All the stars we see in the night sky are in our own Milky Way Galaxy. ... These stars form a large disk whose diameter is about 100,000 light years. Our Solar System is about 25,000 light years away from the center of our galaxy – we live in the suburbs of our galaxy.