They originate from various events (supernovae and so on) within the Milky Way galaxy that is home to the Earth.

它们可以从地球所在的银河系中很多的事件里产生，如超新星事件等。

youdao

NGC 7380 is located in the constellation Cepheus about 7,000 light-years from Earth within the Milky Way Galaxy.

NGC 7380在仙王座，离地球约7000光年远，在银河系中。

youdao

NGC 7380 is located in the constellation Cepheus about 7, 000 light-years from Earth within the Milky Way Galaxy.

NGC 7380在仙王座，离地球约7000光年远，在银河系中。

youdao

Recent observations had suggested that 2 of the 4 spiral arms hold most of the older stars in the Milky Way galaxy.

VOA: special.2009.01.20

They showed that the Andromeda nebula lay far outside our Milky Way Galaxy.

VOA: special.2009.04.29

It is located in the Milky Way galaxy, about 335 light years from Earth.

WSJ: Possible New Planet Spotted Under Formation

It also can help predict how Earth's neighborhood, the Milky Way galaxy, formed and how it might evolve.

WSJ: Scientists Find Hint of Dark Matter

When she was a child a century ago, the known universe extended only to the edge of the Milky Way galaxy.

FORBES: Magazine Article