The Milky Way

Within the Milky Way galaxy, where is Earth located?

Earth orbits the Sun, which is situated in the Orion Arm, one of the Milky Way’s four spiral arms. (Even though the spiral arms of the Milky Way or any other galaxy are not solid structures, the size scale of the galaxy is so large that the density wave will last for millions of years; it is therefore appropriate to say we are “in” the arm at this period in cosmic history.) Earth and the Sun are about twenty-five thousand light-years away from the galactic center.


This is a web preview of the "The Handy Astronomy Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App