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What is Galaxy

  What is Galaxy? The Short Answer:            The Galaxy is a huge collection of gas, dust, and billion of stars and solar systems, all held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole  in the middle. (A supermassive black hole is the biggest kind of black hole. Its gravity is more than a million times stronger than our sun's, Its has very strong gravity that pulls in everything around it. )               We live on a planet called Earth that is part of our solar system. But where is our solar system? It's a small part of the Milky Way Galaxy.   live view of Galaxy by NASA. Hubble Skymap Planets in our Galaxy ?    Mercury : The swiftest planet. Venus    : Earth's superheated twin sister. Earth     : Our home world. Mars     : The Red Planet. Jupiter   : Kind of the planets. Saturn  : Jewel ...

What is Galaxy