They’re like galactic Russian dolls. Our solar system had a galaxy-sized appetite in its younger years. The Milky Way likely grew to its current size by gobbling up smaller solar systems, including a dwarf galaxy whose remnants were absorbed into our own, per a study in the journal Monthly Notices of the Royal Astronomical Society. In other words, it’s literally a galaxy inside a galaxy. Like a cosmic hungry caterpillar, this particular star system — dubbed Loki after the Norse god of trickery —