In the heart of our Milky Way galaxy, two gigantic "bubbles" extend roughly 50,000 light-years above and below the galactic ...

Galaxies, including the Milky Way, grow and evolve by merging with smaller galaxies over billions of years in a process called hierarchical assembly. This cosmic "building block" approach has been ...

Astronomers have used the Gaia space telescope to spy some of the first building blocks of the Milky ... Way galaxy: two ancient streams of stars named Shakti and Shiva that helped our home galaxy ...

In the 1920s, astronomers thought that the Milky Way was the entire universe. Hubble's discovery revealed a much bigger ...

The Milky Way keeps its planets close to its chest ... The stars’ violent upbringing hindered their ability to grow and retain planets, he and astrophysicist Eve Lee, formerly of McGill ...

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.