Our Milky Way is one of more than 100 galaxies bound together by gravity.

Two colliding galaxies have been found to be reorganizing their dwarf satellites, potentially solving a major conundrum ...

One group, led by astronomer R. Brent Tully of the University of Hawai'i measured the motions of some 56,000 galaxies to understand these basins and their distribution in space.

Our Local Group of galaxies contains at least 80 members, the vast majority of which are dwarfs. These small galaxies are somewhat hard to detect in or near the plane of the Milky Way (thus, the ...