Look up into the night sky, and imagine that you’ve never heard the term Milky Way. What would you call that glowing band of stars across the heavens? In Sweden, it’s called Vintergatan, or “Winter Street.” In Hawaii, the Milky Way is sometimes...
fossil group n.— «All that dark matter makes astronomers think that NGC 1132 grew up through the mergers of many smaller galaxies in an entire group, drawn in by the dark matter. That’s why the galaxy is sometimes called a “fossil group.” However...