Comparing Solar Systems and Galaxies

There are thousands of bodies of mass in the universe. These bodies of mass can range from giant galaxies to an individual solar system or even just a single star. Have you ever looked up at the stars at night and just wondered what was up there? Well, there's a lot up there.

A solar system can be defined as a system of bodies orbiting around a star. Solar systems can also have several other systems that are located in them. In our solar system, we have several systems. These systems are the planets and the moons or satellites that surround and orbit around them. These systems revlove around the sun in elliptical motions. These motions follow all of the laws of physics. They each revolve around the sun, and each have their own revolution.

In these solar systems, there can be several types of bodies. There can be physical, terrestial bodies, or there can be gas bodies. An example of a terrestial body is the earth. The earth is made of rock with a metallic core. An example of a gas body is Jupiter. There is no metallic center, and there is a very low density. There can also be smaller bodies in the solar system. These include astroids, comets, and meteors. These can range in materials and origin. These are formed when a star is formed. When there is an explosion that forms a star, the matter that surrounds it gets superheated and begins to form into bodies. These bodies then cool down and eventually morph into what we call planets.

Galaxies are the other major part of the universe.

There are several types of galaxies, they come in different shapes due to gravity. There are Elliptical Galaxies, Spiral, Lenticular, and irregular galaxies. Elliptical Galaxies are low density and have very little matter inside them. They range greatly in size, yet are some of the oldest in the universe. Spiral Galaxies have a largely dense outer area that is full of dust and other gases. There are characteristic arms that branch off from the center of the galaxy. But the center is full of stars, yet devoid of other matter. A Lenticular is sort of a mix between a Spiral and a Elliptical galaxy. There is a large bulge in the center, yet there are no arms. They have been called armless spirals. Irregular Galaxies are the oddballs of the bunch. There are no distinct characteristics, and they have any shape imaginable. The main difference between a solar system and a galaxy is that in a galaxy, there aren't any bodies that surround a center star. There also is no center star in a galaxy, there are thousands in the center.

Galaxies form from a mix of gases that begin to rotate, and as they rotate, gravity forms. This gravity forms a center that causes the gases to collapse inward. They then increase in rotation, which forms a galaxy. So next time you look up at the stars, you can know what is really up there and where they come from.