Galaxies

In our universe there are many beautiful things that astound us but let's start with galaxies.

Beautiful with their many forms, creating disks of dust and stars, but what do we know about them apart from this?

They may be elliptical, spiral, lenticular or irregular. They can hold trillions of stars, stardust, planetary systems, clouds of gas, dark matter and perhaps dark energy, all united by the weakest force in the universe: gravity.

spiral galaxy m-81

Yes, gravity is a very weak force, if we lift an object off the ground, we can do it easily, even though the entire planet is pulling on it, as we lose our grip on the object it will return to it’s previous place, therefore, an object that holds more weight will be harder to lift, because the force of gravity is greater the more mass the object possesses (always taking into account its distance to the force).                  

So let’s start discovering the secrets of galaxies.