But the stellar halo, as this roughly ball-shaped, less dense grouping of stars is called, stretches the limits of the Milky Way out to about 400,000 to 600,000 light-years across. Although it all ...

Astronomers have discovered an extraordinary new giant radio galaxy with plasma jets 32 times the size of our Milky Way. Measuring 3.3 million light-years from end-to-end, the cosmic megastructure was ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. Above a certain size, spiral galaxies shouldn't exist. A single major ...