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Fun Fact 3: What is Milky Way?

Hi all, today Q&A from Grace. What is Milky Way? 

The Milky Way is the galaxy that contains our Solar System. The descriptor "milky" is derived from the galaxy's appearance from Earth: a band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye.  It is made up of at least 100 billion stars, as well as dust and gas. It is so big that light takes  100 000 years to cross from one side to the other.