The image of nearby galaxy Messier 81 was captured by NASA's Spitzer Space Telescope. The galaxy is located in the northern constellation of Ursa Major (which also includes the Big Dipper).

Scientists have discovered that strange radio pulses from the Ursa Major constellation originate from a pair of stars, a ...

The radio pulse repeats every 2 hours and was first detected a decade ago. It came from the direction of the Big Dipper. This new research indicates that the cause of this repeating radio signal ...

If its gaseous halo could be seen with the naked eye, it would be about three times the width of the Big Dipper--easily the biggest feature on the nighttime sky.