The Hubble Telescope took a snapshot of what astronomers are calling the Bullseye Galaxy. The distant galaxy contains nine rings of stars that were formed when a blue dwarf galaxy crashed through the ...

The brightest star in the nighttime sky, Sirius, or the Dog Star, greatly outshines its white dwarf companion, Sirius B. At 8.6 light-years away, Sirius B is the nearest known white dwarf star to ...

The gargantuan galaxy LEDA 1313424 is rippling with nine star-filled rings after an "arrow"—a far smaller blue dwarf galaxy—shot through its heart. Astronomers using Hubble identified eight ...