Where would you most likely find an ionization nebula?
Where would you be most likely to find an ionization nebula? the orbits of stars in the galactic center.
What is an ionization nebula quizlet?
What is an ionization nebula? A colorful cloud of gas that glows because it is heated by light from nearby hot stars.
What are all elliptical galaxies lacking quizlet?
Like the halos of spiral galaxies, elliptical galaxies lack cool gas and so do not have much star formation. As a result, we see few hot, young stars in these galaxies.
What is the name of an elliptical galaxy?
One of the most famous elliptical galaxies is Cygnus A, which is located roughly 600 million light-years from Earth and is an extremely bright radio source.
Why are ionization nebulae found near hot massive stars?
what are ionization nebulae, and why are they found near hot, massive stars? ionization nebulae are colorful, wispy blobs of gas found near hot star. they require the hot stars' ultraviolet light to raise the electrons in the atoms of the gas to high energy levels or to ionize the atoms completely.
Why are we unlikely to find Earthlike planets around halo stars in the galaxy?
The motions of the gas and stars at the center indicate that it contains a million solar masses within a region only about 1 parsec across. Why are we unlikely to find Earth-like planets around halo stars in the galaxy? Halo stars formed in an environment where there were few heavy elements to create rocky planets.
Which of the following is not one of the main categories for the classification of galaxies?
There are three main classes of galaxies: Irregulars, Ellipticals, and Spirals. Irregular galaxies, as their name suggests, do not fit into the "normal" classification scheme.
What are the names of the three types of galaxies?
Types of Galaxies Astronomers classify galaxies into three major categories: elliptical, spiral and irregular.
Do elliptical galaxies have nebulae?
In the larger nearby ellipticals, many globular clusters can be identified. Dust and emission nebulae are not conspicuous in elliptical galaxies, but many do contain a small amount of interstellar matter.
How do elliptical galaxies differ from spiral galaxies?
Elliptical galaxies are ellipsoids with no clearly visible internal structure. Spiral galaxies have a very dense nucleus and a region of stars bulging outwards from the disks and, therefore, called the central bulge. Elliptical galaxies also have dense centers, but they do not protrude from the body of the galaxy.
What can be found in a spiral galaxy?
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.
How does an SA galaxy differ from an Sc galaxy?
In Sa galaxies, the arms are tightly wrapped around the bulge, while in Sc galaxies the arms are much looser, and often appear to be more clumpy than the smooth arms of an Sa galaxy. Sb galaxies have intermediate properties between those of Sa and Sc galaxies.
How would you describe the Andromeda Galaxy?
Andromeda, also known as Messier 31 (M31), is a spiral galaxy located about 2.5 million light years away. It is thought that the Milky Way and Andromeda will collide several billion years from now. The black holes located in both galaxies will then reside in the large, elliptical galaxy that results from this merger.
How are the elliptical galaxies different from spiral galaxies?
Spiral and barred spiral galaxies are subclassified by how tightly wound the spiral arms appear. Elliptical galaxies don't show any structure, but have a smooth ellipsoidal shape, appearing as a large spherical or elliptical ball of stars. Elliptical galaxies can be classified in terms of how long and thin they appear.
Why do we expect WIMPs to be distributed throughout galactic halos rather than settled into the galaxy’s disk?
Why do we expect WIMPs to be distributed throughout galactic halos, rather than settled into a disk? Since they do not interact with the electromagnetic force, they do not feel friction or drag and hence do not contract with the rest of the protogalactic cloud.
What’s the difference between spiral and elliptical galaxies?
Spiral and barred spiral galaxies are subclassified by how tightly wound the spiral arms appear. Elliptical galaxies don't show any structure, but have a smooth ellipsoidal shape, appearing as a large spherical or elliptical ball of stars. Elliptical galaxies can be classified in terms of how long and thin they appear.
What is the least common type of galaxy?
The rarest type of galaxies is the elliptical double-ringed galaxy. PGC 1000714 is an example. Estimates suggest that around 0.1% of galaxies are this type. It is sometimes named the Hoag-type galaxy.
What is in an elliptical galaxy?
Elliptical galaxies are made up of mostly old stars, and do not have much gas and dust. There is very little new star formation in these galaxies. Elliptical galaxies also come in many sizes. The largest galaxies we see are ellipticals, but, elliptical galaxies can also be small.
Do irregular galaxies have nebulae?
Irregulars are also very rich in clouds of hydrogen, which, when heated by nearby stars, glow to form the luminous nebulae.
What do elliptical galaxies contain?
Elliptical galaxies are ellipsoidal in shape, contain no spiral arms, contain little interstellar gas or dust, and are found mostly in rich clusters of galaxies. Elliptical galaxies appear typically yellow-red, as opposed to spirals which have spiral arms that appear quite blue.
Are most galaxies elliptical?
Elliptical galaxies are believed to make up approximately 10–15% of galaxies in the Virgo Supercluster, and they are not the dominant type of galaxy in the universe overall. They are preferentially found close to the centers of galaxy clusters.
Which of the following is not a difference between spiral and elliptical galaxies?
Which of the following is NOT a difference between spiral and elliptical galaxies?" Your answer : Spiral galaxies are younger, whereas elliptical galaxies are older. Correct!
What are elliptical galaxies made of?
Elliptical galaxies are made up of mostly old stars, and do not have much gas and dust. There is very little new star formation in these galaxies. Elliptical galaxies also come in many sizes. The largest galaxies we see are ellipticals, but, elliptical galaxies can also be small.
What is found in an irregular galaxy?
Irregular galaxies have no particular shape. They are among the smallest galaxies and are full of gas and dust. Having a lot of gas and dust means that these galaxies have a lot of star formation going on within them.
How does a Sa galaxy differ from SC galaxy quizlet?
How does an Sa galaxy differ from an Sc galaxy? The Sa galaxy has less gas and dust. What parameter must we know to determine the linear diameter and luminosity of a particular galaxy? The distance to the galaxy.
What is the difference between an SB galaxy and an SC galaxy quizlet?
Sb galaxies are intermediate. Sc galaxies have small nuclei, lots of gas and dust and many hot, bright stars.
What type galaxy is Andromeda?
Andromeda, also known as Messier 31 (M31), is a spiral galaxy located about 2.5 million light years away.
How is the Andromeda galaxy different?
The Andromeda Galaxy has a past involving collisions with and accretion of other galaxies. Its peculiar close companion, M32, shows a structure that indicates that it was formerly a normal, more massive galaxy that lost much of its outer parts and possibly all of its globular clusters to M31 in a past encounter.
What do spiral and lenticular galaxies have in common?
Lenticular galaxies share kinematic properties with both spiral and elliptical galaxies. This is due to the significant bulge and disk nature of lenticulars. The bulge component is similar to elliptical galaxies in that it is pressure supported by a central velocity dispersion.
Which of the following best describes how galaxies are distributed on large scales in the universe?
Which of the following best describes how galaxies are distributed on large scales in the Universe? Galaxies appear to be distributed in chains and sheets that surround great voids.