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Monster colliding black holes might lurk on the edge of spiral galaxies

Galactoseismology: Discovery of a Cluster of Receding, Variable Stars (Selected)

Clustered Cepheid Variables 90 kpc from the Galactic Center (Selected)

The Sagittarius impact as an architect of spirality and outer rings in the Milky Way

Finding Dwarf Galaxies From Their Tidal Imprints (Selected)

Tidal Imprints of a Dark Sub-Halo