Galaxies like the Milky Way grow by merging with smaller galaxies over billions of years, unlike dwarf galaxies, which have long been thought to lack the heft to attract mass and grow in the same way.

These massive currents carry material on a journey through and around star-forming galaxies before they settle and form stars ...

If we could go back 101 years, we would encounter a time when scientists still thought the Milky Way was the entirety of our ...