Which of the following is not a type of galaxy?
What are 3 types of galaxies?
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.
Is irregular a type of galaxy?
An irregular galaxy is the catchall name given to any galaxy that does not neatly fit into one of the categories of the Hubble classification scheme. They have no defined shape nor structure and may have formed from collisions, close encounters with other galaxies or violent internal activity.
What is the most accurate way to determine the distance to a very distant irregular galaxy?
The only effective way found so far for measuring distances to the most-distant detectable galaxies is to use the brightness of a certain type of supernova, called Type Ia.
How did we infer that the Milky Way is a spiral galaxy?
Our Solar System is about 25,000 light years away from the center of our galaxy – we live in the suburbs of our galaxy. Just as the Earth goes around the Sun, the Sun goes around the center of the Milky Way. The concentration of stars in a band adds to the evidence that the Milky Way is a spiral galaxy.
What makes the Milky Way a spiral galaxy?
As dust and gas is compressed in the spirals, it is heated up and results in the formation of new stars. Astronomers have determined that the Milky Way is a spiral galaxy by mapping the movements of stars and hydrogen clouds in the disk.
What are the four main parts of a spiral galaxy?
What are the four main parts of a spiral galaxy? A halo, bulge, dish, and arms.
What can be found in a spiral galaxy?
Spiral galaxies usually consist of a rotating disk that contains stars, dust, gas, and a concentration of stars known as the bulge in the center. These bulges are often surrounded by a faint halo of stars, many of which reside in globular clusters – a spherical collection of stars that orbits a galactic core.
When did the Milky Way become a spiral galaxy?
Gradually, the galaxies that were to become spirals lost most of their big clumps, and a central, bright bulge would appear; the smaller clumps throughout the galaxy would begin to form indistinct, “woolly” spiral arms. These arms would only become very distinct arms once the universe was about 3.6 billion years old.
How old are the stars in a spiral galaxy?
12.8 billion years
What is rare in an elliptical galaxy but common in a spiral galaxy?
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.
What is the major difference between an elliptical galaxy and a spiral galaxy?
The major difference between spiral and elliptical galaxies is that elliptical galaxies lack a significant disk component, although both types have the halo component.
Is this a photo of a spiral galaxy or an elliptical galaxy and how do you know?
Is this a photo of a spiral galaxy or an elliptical galaxy, and how do you know? It is a spiral galaxy, because we can see a dusty disk going across the center. This photo shows the Large Magellanic Cloud, or LMC for short. The oldest stars in these galaxies are much older than the oldest stars in our own Milky Way.
Can an elliptical galaxy evolve into a spiral?
There is no way that an elliptical galaxy could spontaneously begin rotating, so there is no way an elliptical galaxy could turn into a spiral galaxy. Although Hubble was wrong about his theory of galaxy evolution, his diagram provides a useful way to classify galaxies.
Does an elliptical galaxy rotate like a spiral galaxy explain?
Explain. Does an elliptical galaxy rotate like a spiral galaxy? Explain. No, so we can’t determine a rotational velocity.
What does a spiral galaxy look like?
Perhaps the most familiar kind of galaxy are spiral galaxies. They have a distinctive shape with spiral arms in a relatively flat disk and a central “bulge”. The bulge has a large concentration of stars. The arms and bulge are surrounded by a faint halo of stars.
Why does an elliptical galaxy look like one giant star?
An elliptical galaxy looks as if it is a giant star because it lacks the distinctive structure of a spiral galaxy, where the bulge is surrounded by a…
Why are elliptical galaxies brightest toward the center?
How many stars are there in the Milky Way galaxy? Elliptical galaxies are brightest toward the center. The center is crowded with stars, and the number of stars decreases farther out.
Are elliptical galaxies flat?
The ellipticals are smooth and round or elliptical, the spirals are flat with a spiral pattern in their disk, and the irregulars have stars and gas in random patches. Most galaxies are small and faint so only the luminous galaxies are seen at great distances.
What are 3 characteristics of elliptical galaxies?
An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image. They are one of the three main classes of galaxy described by Edwin Hubble in his Hubble sequence and 1936 work The Realm of the Nebulae, along with spiral and lenticular galaxies.
What type of galaxy has the youngest stars?
|Term What is the shape of the Milky Way Galaxy?||Definition A huge, slowly revolving disk.|
|Term Which galaxy type has the oldest stars?||Definition Elliptical|
|Term Which galaxy types has the youngest stars?||Definition Irregular|
|Term Which galaxy type are typically the largest galaxies in the universe?||Definition Spiral|