After more than a decade of charting the stars with extraordinary precision, the Gaia spacecraft has completed its mission.

We've known for over 30 years that there are other stellar systems in our galaxy, but we don't have any idea how many there ...

Scientists, using infrared images from NASA's Spitzer Space Telescope, have found that the Milky Way’s graceful spiral structure is primarily shaped by two arms extending from a central bar of stars.

The Small Magellanic Cloud, a dwarf galaxy about 200,000 light-years from the solar system, can be seen with the naked eye ...

The galactic center may hide an unsuspected population of stellar black holes, far denser than expected. A recent study ...