Galaxy

Hey there ! I have something good to share with you. This thing is actually we've learned during our primary school and wasn't this detail. Our topic today is GALAXY. What is it ? Lets find out together. 


A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias , literally "milky", a reference to the Milky Way. Galaxies range in size from dwarfs with just a few hundred million (10⁸) stars to giants with one hundred trillion (10¹⁴) stars,each orbiting its galaxy's center of mass.

Galaxies are categorized according to their visual morphology as elliptical,spiral, or irregular. Many galaxies are thought to have black holes at their active centers. The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times greater than the Sun. As of March 2016, GN-z11 is the oldest and most distant observed galaxy with a comoving distance of 32 billion light-yearsfrom Earth, and observed as it existed just 400 million years after the Big Bang.

The space between galaxies is filled with a tenuous gas having an average density of less than one atom per cubic meter. The majority of galaxies are gravitationally organized into groups, clusters, and superclusters. At the largest scale, these associations are generally arranged into sheets and filamentssurrounded by immense voids. The largest structure of galaxies yet recognised is a cluster of superclusters that has been named Laniakea.

Wasnt it nice and amazing ? Allah is the best creator ! 

thats all for now. bye bye!!