Scientists just found the Milky Way’s edge and it’s closer than expected

Defining where the Milky Way ends has always been challenging because its disk does not stop abruptly -- it gradually fades into space. Now, for the first time, an international team of astronomers has pinpointed the boundary of the Galaxy's star-forming disk by examining the ages of stars. Their findings show that most star formation in the Milky Way takes place within about 40,000 light-years of the Galactic Center.

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