Galaxies
Galaxies are HUGE systems of BILLIONS of stars. Galaxies are made up of meteors, asteroids, stellar remnants, gas, dust, comets, planets, stars, and other matter. There are three types of galaxies: Spiral, Irregular, and Elliptical. A man named Edwin Hubble found a way to classify the galaxies.
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spiral galaxy
Of the observed galaxies in the universe, about 77% of galaxies are spiral. One of them is our galaxy, the Milky Way Galaxy. There are two different types of spiral galaxies: barred and regular. Barred is the same as a regular spiral galaxy except that it has a different pattern of stars, dust, gas, etc. The parts of a spiral galaxy is the core, main bulge, disk, and halo. A spiral galaxy is shaped like a disk with a bulge in the middle.
Irregular galaxy
Irregular Galaxies are the galaxies who cannot be fitted as a spiral or elliptical galaxy. About 3% of galaxies observed inn the universe have an undefined shape, so they are irregular galaxies. They're basically a scattered pattern of stars, dust, gas, etc. Every Irregular Galaxy is different from another. Some scientists believe that they are just collisions of former regular galaxies. The stars in an Irregular Galaxy are usually young.
Elliptical galaxy
Ellipse means "oval shaped". That's the shape we describe an elliptical galaxies. There isn't much gas and dust in this galaxy. The amount of stars and size varies in elliptical galaxies. They are the most abundant galaxies in the universe, but usually outshone by younger brighter galaxies because mostly older stars populate these galaxies.