2024年10月22日 · Scientists sometimes categorize galaxies based on their shapes and physical features. Other classifications organize galaxies by the activity in their central regions – powered by a supersized black hole – and the angle at which we view them.

2025年4月4日 · Learn about the three general types of galaxies: spiral, elliptical, and irregular. Almost all current systems of galaxy classification are outgrowths of the initial scheme proposed by the American astronomer Edwin Hubble in 1926.

There are four distinct types of galaxies in the universe, elliptical, spiral, barred spiral, and irregular. Although these are the four main types, there are various types of galaxies and the way in which they are classified is by their shape.

Spiral galaxies are the most common type in the universe. Our Milky Way is a spiral, as is the rather close-by Andromeda Galaxy. Spirals are large rotating disks of stars and nebulae, surrounded by a shell of dark matter. The central bright region at the core of a galaxy is called the “galactic bulge”.

2022年1月19日 · A galaxy is a huge collection of gas, dust, and billions of stars all held together by gravity. All galaxies are made up of these same things. However, they come in many different shapes and sizes. Here are a few types of galaxies: Spiral galaxies look like giant pinwheels. The arms of the pinwheel are made up of stars and lots of gas and dust.

As discussed in the section on galaxy classifications, Hubble found four distinct types of galaxies: elliptical, spiral, spiral barred, and irregular. Although there are different types, we also learned that each galaxy contains the same elements, but these are arranged differently for each type.

2022年12月22日 · In total, there are four main groups of galaxies: spiral, elliptical, irregular, and peculiar. Each of these types of galaxies have their own unique features and history, adding more beauty to an already stunning universe. Hubble image of …

As it turns out, the biggest and most luminous galaxies come in one of two basic shapes: either they are flatter and have spiral arms, like our own Galaxy, or they appear to be elliptical (blimp- or cigar-shaped). Many smaller galaxies, in contrast, have an irregular shape.

2019年1月4日 · Galaxies are classified by their shape. Each type has different characteristics and a different history of evolution. Some, like the Milky Way, have arms spiraling outward around …

Galaxies are vast systems composed of stars, dust, and gas, bound together by gravity, and they come in several distinct types: elliptical, spiral, and irregular. Elliptical galaxies, which account for about 70% of all galaxies, vary from nearly spherical to elongated shapes and typically contain older stars with minimal gas and dust.