Precision measurements of elderly stars yield some of the first direct evidence that the Milky Way grew more massive by devouring neighboring galaxies.
Debris streams in the solar neighborhood as relicts from the formation of the Milky Way.
Lee, Y.-W., et al . Multiple stellar populations in the globular cluster w Centauri as tracers of a merger event. Ill-fated Milky Way neighbor found. Garching bei M nchen Germany From Science News , Vol. Copyright 1999, Science Service.