do irregular galaxies have young stars?
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Elliptical galaxies contain primarily old stars, and do not have much gas and dust. There is very little new star formation in these galaxies. Irregular galaxies have no particular shape. They are among the smallest galaxies and they contain a vast amount of gas and dust.
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A constellation is the imaginary pattern formed by a few stars. ... A galaxy is group of millions or even billions of stars, and it's planets and satellites and all of the stuff. Galaxies can be of these shapes- Spiral, barred spiral, elliptical and irregular. There are quadrillion a of galaxies in the OBSERVABLE universe.
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While spiral galaxies are bright, elliptical galaxies are dim. Spiral galaxies are hotbeds of star formation, but elliptical galaxies aren't nearly as prolific because they contain less gas and dust, which means fewer new (and brighter) stars are born.
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For low-mass stars (left hand side), after the helium has fused into carbon, the core collapses again. As the core collapses, the outer layers of the star are expelled. A planetary nebula is formed by the outer layers. ... Like low-mass stars, high-mass stars are born in nebulae and evolve and live in the Main Sequence.
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is that star is any small luminous dot appearing in the cloudless portion of the night sky, especially with a fixed location relative to other such dots while protostar is (star) a collection of gas and dust in space with high temperature that usually grows to the point of beginning nuclear fusion and becoming a star.
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Astronomers group galaxies by shape, and although there are many different types of galaxies, most fall into one of three categories: spiral, elliptical or irregular.
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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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Stars form immense groups called galaxies. A galaxy can contain many millions of stars, held together by the force of gravity. Our Sun is in a spiral galaxy called the Milky Way. The Sun is about half-way from the centre of the galaxy, on one of the arms.
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Not necessarily. Each constellation is a collection of stars that are distributed in space in three dimensions – the stars are all different distances from Earth. The stars in a constellation appear to be in the same plane because we are viewing them from very, very, far away.
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None of the stars are on fire. They are just balls of gases and are not burning. They are not ignited. They are under thermonuclear fusion reactions.
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The most fundamental difference between the galaxy types is that spiral galaxies have a rotating disk of gas in which ongoing star formation can occur, while elliptical galaxies do not. Therefore, once gas is stripped out of a galaxy, it can no longer have a gaseous disk.
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A galaxy contains stars, gas, and dust. In a spiral galaxy like the Milky Way, the stars, gas, and dust are organized into a bulge, a halo, and a disk containing spiral arms. Elliptical galaxies have a bulge shape and a halo, but do not have a disk. Bulge—A round structure made up primarily of old stars, gas, and dust.
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A spiral galaxy consists of a spinning, flattened disk with arms that rotates very fast. An elliptical galaxy is the most common type of galaxy, has a roundish shape, and demonstrates little or no star formation. An irregular galaxy is a galaxy with no defined shape that has very young stars.
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There are four main categories of galaxies: elliptical, spiral, barred spiral, and irregular. These types of galaxies are further divided into subcategories while at the same time other types of galaxies exist based on their size and other unique features.
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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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-- there are a total of just over 9,000 stars that the human eye can discern. Every single one of them is contained within our own galaxy, though, so none of these are millions of light years away. There are some that are thousands of light years distant, though.
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~ HECTOR MACPHERSON, JR. FOR POPULAR ASTRONOMY. Even to the unaided eye, it is obvious that the stars are not evenly distributed over the heavens. The eye is at once attracted by such brilliant regions as Orion and Cygnus; while in Virgo and Capricornus there is plainly a dearth of stars.