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What makes up a galaxy?


A galaxy is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium of gas and dust, and an essential but poorly understood component tentatively dubbed dark matter.

Components of a galaxy depend on what kind of galaxy you’re talking about. Different types of galaxies have different shapes and elements.

A typical galaxy contains hundreds of billions of stars, with hundreds of billions of planets, many of which may support life.

Galaxy types

There are three main types of galaxies determined by their shape and structure.

●     Spiral galaxies consist of a flattened sphere with spiral arms extending from the center into space. These arms contain young stars and star clusters, as well as nebulae.

●     Elliptical galaxies are ellipsoidal and contain mainly old stars. They also tend to collect little dust or gas as they lack the energy needed for new star formation.

●     Irregular galaxies have no particular shape and appear disorganized compared to other types of galaxies. They often come about when two or more galaxies collide with each other.

Here are some things that make up a galaxy, including nebulae, stars, Meteors, planets, and asteroids.


Nebulas are clouds of gas and dust found throughout the galaxy, and they’re pretty similar to stars in that they produce their light.

But unlike stars, which are held together by gravity and burn for millions of years before exploding. Nebulas can vary significantly in size: some can be larger than entire galaxies.

Nebulas are formed from the remains of dying stars. When a star runs out of fuel, it goes supernova—an explosion so powerful that it destroys everything around it.

-This includes planets, moons, and other nearby stars. The expanding debris from this explosion forms a nebula that looks something like a glowing cloud:


The stars in a galaxy are held together by gravity, and they orbit around the center of the universe, which is an area of space containing a supermassive black hole.

Stars are made up of hydrogen and helium, formed from clouds of gas and dust, which collapse under their weight to form a dense region called a protostar.


Planets are similar to stars in that they are balls of gasses, but they are much smaller and relatively round.

Planets also generally revolve around stars. Unlike stars, planets have a solid surface and a day/night cycle like Earth does.


Meteors are tiny rocks that fall from space. They’re also called shooting stars, but they aren’t stars at all. They’re made of stone and metal and come in different sizes.

Meteors aren’t to be confused with asteroids or comets: both are much smaller than meteors, as comets are just a few miles wide while asteroids can be up to a few hundred miles across.

To help avoid confusion, we can say that meteors fall through Earth’s atmosphere while asteroids orbit around the Sun without falling into it (like our moon does).


Asteroids are small, rocky objects that orbit the Sun. They are smaller than planets and found in the Asteroid Belt between Mars and Jupiter.

Unlike most other objects found in space, asteroids do not have enough mass to become spherical like planets, so instead, they take on a more irregularly shaped form. Scientists think this was because of collisions between larger asteroids when they formed billions of years ago.


These are just some of the many things that make up a galaxy. The study of the structure and evolution of galaxies is a significant focus of astronomy.

We hope this article has given you a better sense of how vast and complex they can be.

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