Our solar system exists in one of the Milky Way's smaller spiral arms — the Orion-Cygnus arm — which radiates out from the center of the galaxy. While we can use our vantage point to view ...

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

Over the past decade or so, astronomers have speculated about the characteristics of rogue planets in the Milky Way galaxy. These "free-floating" worlds don't orbit stars, but instead roam the ...

This ultra-massive system ... Milky Way -- both in shape, size, and stellar mass," she adds. Its disk spans over 60,000 light-years, comparable to our own galaxy, and contains more than 100 ...