The Milky Way
On a clear, dark night, one can see a long, irregular band of light in the sky that somewhat resembles a milky streak.  This is the Milky Way.  In the beginning of the 17th Century, the famous astronomer, Galileo, discovered that it consists of billions of faint stars.

The Milky Way is the galaxy that contains our solar system, plus all the other stars visible to the naked eye.
Part of the Milky Way as seen through a telescope.
Source: Guillaume Poulin
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