A collision between our Milky Way galaxy and the neighboring Andromeda galaxy, long considered inevitable, may be in question ...

The long-proposed Milky Way and Andromeda galactic merger might not be as certain as astronomers previously believed.

Now, computer simulations may have revealed the cause: a mysterious event that knocked our galaxy's invisible halo of dark matter out of alignment. The scientists published their findings Sept.

Astronomers have discovered more than 200 distant variable stars known as RR Lyrae stars in the Milky Way’s stellar halo. The most distant of these stars is more than a million light years from Earth, ...

In a new study, NASA's Hubble Space Telescope mapped Andromeda's halo — the envelope of gas that surrounds the galaxy — in unprecedented detail. The Milky Way and Andromeda are very close ...

However, the USTC researchers have revealed that dark matter halos hosting dwarf galaxies also exhibit halo bias, which is ...

A halo of stars surrounding a galaxy in the relatively nearby Virgo cluster is missing, possibly torn away by a neighboring galaxy or snuffed out by the collapse of the cluster itself. The victim ...