Did the Milky Way Devour Other Galaxies?

Did the Milky Way Devour Other Galaxies?
ESO/S. Brunier

It's no secret that the farther away an object is, the more difficult it is to observe. Galaxies like the Milky Way have several components: a disk of stars, which includes our galaxy's arms; a bar-shaped bulge in the center, and a large, spherical outer halo of stars. While the Milky Way's stellar halo certainly isn't a mere hop, skip, and a jump away, its interior boundary is close enough to observe in detail and the inner portion of the halo has long been our main source for understanding the stellar halo as a whole.

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