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

For years, astronomers have been puzzled by the presence of two gigantic, high-energy “bubbles” towering over and beneath the Milky Way’s center, extending 50,000 light-years into space. First ...

The core of the Milky Way in Sagittarius low in the south over the Frenchman River valley at ... [+] Grasslands National Park, Saskatchewan, a Dark Sky Preserve. (Photo by: Alan Dyer/VWPics ...

100 years ago, Hubble revealed a universe of galaxies that existed beyond ours — but he couldn't have done it without a little help. If we could go back 101 years, we would encounter a time when ...