What are the three classifications used for galaxies?

In 1926, Edwin Hubble proposed a classification system for galaxies, based on their shape as observed from Earth. The Hubble sequence divides regular galaxies into three broad classes: elliptical; lenticular and spiral. A fourth class is used for galaxies with irregular appearance.

What are the properties of galaxies?

Galaxy properties

• have smooth light distributions, where the isophotes (lines of constant SB) have (nearly) elliptical shapes.
• have no current star formation.
• have old stars.
• have little gas and dust.
• occur preferentially in groups and clusters of many Es.

What are the 4 different classes of galaxies?

Galaxies 101 Scientists have been able to segment galaxies into 4 main types: spiral, elliptical, peculiar, and irregular. Now, let’s dive in!

What are irregular galaxy properties?

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 properties are shared by spiral galaxies?

Most spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge. These are often surrounded by a much fainter halo of stars, many of which reside in globular clusters.

What are the 4 main types of galaxies?

In 1936, Hubble debuted a way to classify galaxies, grouping them into four main types: spiral galaxies, lenticular galaxies, elliptical galaxies, and irregular galaxies.

Did you know facts about the galaxy?

10 Facts about the Milky Way

• It’s warped.
• It has an invisible halo.
• It has over 200 billion stars.
• It’s really dusty and gassy.
• It was made from other galaxies.
• We can’t take pictures of it.
• There is a black hole at the center.
• It’s almost as old as the Universe itself.

How do you sort galaxies?

Hubble’s system divides galaxies into three basic cate- gories: 1) elliptical galaxies, relatively featureless spheri- cal or ellipsoidal (football-shaped) collections of stars; 2) spiral galaxies, with their distinctive arms of stars that spiral out from their centers; and 3) irregular galaxies, a catchall category …