A simile is a figure of speech that directly compares two things through some connective, usually like, as, than, or a verb such as resembles.. A simile differs from a metaphor in that the latter compares two unlike things by saying that the one thing is the other thing.
A galaxy is an enormous collection of gas, dust and billions of stars held together by gravity. One galaxy can have hundreds of billions of stars and be as large as 200,000 light years across.
The galaxy is about 2.5 million light-years from Earth. (A light-year is the distance that light travels in a vacuum in a yearabout 5.88 trillion miles [9.46 trillion km].) It is estimated to be about 160,000 light-years in diameter and to contain more than 2 trillion stars.