What are the characteristics of an elliptical galaxy?

Elliptical galaxies are characterized by several properties that make them distinct from other classes of galaxy. They are spherical or ovoid masses of stars, starved of star-making gases. The smallest known elliptical galaxy is about one-tenth the size of the Milky Way.

What is the average age of an elliptical galaxy?

These features called tidal streams in the astronomers parlance are typical residuals from a galaxy merger. They are known not to survive in this shape and brightness for more than a few billion years, hence the new age estimate of the resulting elliptical galaxies.

How old are the stars in the elliptical galaxy?

Because elliptical galaxies contain older stars and less gas, scientists think that they are nearing the end of the evolution line for galaxies. The universe is a violent place, and collisions between galaxies are frequent — indeed, the Milky Way is due to crash into the Andromeda Galaxy in a few billion years.

What does the elliptical galaxy look like?

Elliptical galaxies range from circular (remember, a circle is an ellipse!) to long, narrow, and cigar-shaped. Elliptical galaxies are denoted by the letter E. They are also given a number from 0 to 7. An E0 galaxy looks like a circle. An E7 galaxy is very long and thin.

Are most galaxies elliptical?

This range is much broader for this galaxy type than for any other. The smallest, the dwarf elliptical galaxies, may be no larger than a typical globular cluster, but contain a considerable amount of dark matter not present in clusters. Most of these small galaxies may not be related to other ellipticals.

What is the average age of an elliptical galaxy?

These features called tidal streams in the astronomers parlance are typical residuals from a galaxy merger. They are known not to survive in this shape and brightness for more than a few billion years, hence the new age estimate of the resulting elliptical galaxies.

What is the age of the stars in a elliptical galaxy?

Because elliptical galaxies contain older stars and less gas, scientists think that they are nearing the end of the evolution line for galaxies. The universe is a violent place, and collisions between galaxies are frequent — indeed, the Milky Way is due to crash into the Andromeda Galaxy in a few billion years.

What is the closest galaxy to ours?

Andromeda galaxy

What are two characteristics of irregular shaped galaxies?

Having a lot of gas and dust means that these galaxies have a lot of star formation going on within them. This can make them very bright. The Large and Small Magellanic Clouds are examples of irregular galaxies. They are two small galaxies which orbit around our own Milky Way Galaxy.

What happens when two galaxies collide?

This material will interact when the galaxies collide. There is also friction between the gas in the colliding galaxies, causing shock waves that can trigger some star formation in the galaxies. These processes can radically affect the galaxies. For example, two spiral galaxies can merge to form an elliptical galaxy.

How did the galaxies form?

One says that galaxies were born when vast clouds of gas and dust collapsed under their own gravitational pull, allowing stars to form. The other, which has gained strength in recent years, says the young universe contained many small “lumps” of matter, which clumped together to form galaxies.

How are irregular galaxies different from spiral and elliptical galaxies?

An elliptical galaxy is basically all bulge with no disk. They range in shape from nearly spherical to greatly elongated football shapes, and in size from smallest to biggest known galaxies. They do not have spiral arms and have little or no star formation taking place within them.

How many galaxies are there in the world?

According to the best estimates of astronomers there are at least one hundred billion galaxies in the observable universe. They’ve counted the galaxies in a particular region, and multiplied this up to estimate the number for the whole universe.

What does a barred spiral galaxy look like?

A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars. Bars are found in approximately two-thirds of all spiral galaxies. Bars generally affect both the motions of stars and interstellar gas within spiral galaxies and can affect spiral arms as well.

How old is an irregular galaxy?

The very bright stars in the picture, those with spikes around them, are stars in the foreground belonging to the Milky Way. The main body of SagDig is rich in gas, and contains many regions of active star formation. Indeed, the average age of the stars in the galaxy is a relatively young 4 to 8 billion years.

Is the Milky Way is an elliptical galaxy?

In a spiral galaxy like the Milky Way, the stars, gas, and dust are organized into a “bulge,” a “disk” containing “spiral arms,” and a “halo.” Elliptical galaxies have a bulge-like central region and a halo, but do not have a disk.

What is an elliptical galaxy made up of?

E0 ellipticals are nearly circular, while E7s are very stretched out. 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.

What are the two irregular galaxies that orbit the Milky Way?

Large Magellanic Cloud: a dwarf irregular satellite galaxy of the Milky Way. Small Magellanic Cloud: a dwarf irregular satellite galaxy of the Milky Way.

How are the elliptical and spiral galaxies different?

An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile. Unlike flat spiral galaxies with organization and structure, they are more three-dimensional, without much structure, and their stars are in somewhat random orbits around the center.

What is the elliptical galaxy that is closest to the Milky Way?

Prior to that, the Large Magellanic Cloud was thought to be our closest neighbor. The Andromeda Galaxy (M31) is the closest spiral galaxy to us, and though it’s gravitationally bound to the Milky Way, it’s not the closest galaxy by far – being 2 million light years away.

What is the name of the galaxy we live in?

As we are part of the solar system Earth pretty much follows the path of the sun as it goes through its own orbit around the galaxy. The Milky Way is a spiral galaxy type so it has arms sort of like an octopus. The Sun is located near the outward tip of the Sagittarius arm of the Milky Way.

What is an irregular galaxy look like?

Irregular Galaxies. Galaxies that can’t be classified as either spiral or elliptical are called irregular galaxies. Every irregular galaxy is unique. It doesn’t look like any other galaxy.

What is the name of an irregular galaxy?

Also, in some irregular galaxies, like M82, young stars eject energetic bubbles gas, giving the galaxy a blobby look. The Large Magellanic Cloud (LMC) is an irregular-shaped galaxy in the Local Group. The irregular shape may be the result of a disturbance, perhaps a collision of two galaxies.

Originally posted 2022-03-31 05:21:08.