... Star Atlas . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... galaxies . stars . ... Cosmic dance helps galaxies lose weight . ... D'Onghia and her colleagues simulated encounters between galaxies to determine how dwarf galaxies lose much of their stars and gas. ... Like in a cosmic dance, the encounter triggers a gravitational resonance that strips stars and gas from the dwarf galaxy, producing long visible tails and bridges of stars," said D'Onghia. ...