What is a galaxy ?

​A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole in the middle. ... Some scientists think there could be as many as one hundred billion galaxies in the universe.

​How many years before Galaxy was formed ?

​Observations by Hubble Space Telescope and ground-based instruments show that the first galaxies took shape as little as one billion years after the Big Bang, which probably took place about 13 billion to 14 billion years ago. There are two leading theories to explain how the first galaxies formed.

​how galxy was formed ?

​Galaxies are thought to begin as small clouds of stars and dust swirling through space. As other clouds get close, gravity sends these objects careening into one another and knits them into larger spinning packs.

this is the galaxy

​This is the one of 125 billion other galaxies

​Milky way

​This is the galaxy in which we are . The milky way .

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​Watch this video about big bang theory . link below . And our next topic is big bang theory .

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​sorry i can't share with you so just watch dr binocs show big bang theory in youtube .