Our Milky Way galaxy appears to have flipped 90 degrees long ago. But why?
An artist's impression of the collision between the Milky Way and the Gaia-Sausage-Enceladus dwarf galaxy.
The arrows indicate the motion of stars from the dwarf.
An artist's impression of the collision between the Milky Way and the Gaia-Sausage-Enceladus dwarf galaxy.
The arrows indicate the motion of stars from the dwarf.