A newly discovered hot halo, a cosmic fountain and ghostly bubbles produced by an ancient explosion could change the way scientists look at galaxies, including our own Milky Way, astronomers reported on January 8, 2002. All three findings point to dynamic movement in galaxies and in monstrous galactic clusters, the largest stable structures in the universe. [Artist's conception of how the very early universe (less than 1 billion years old) might have looked when it went through a voracious onset of star formation, converting primordial hydrogen into a myriad of stars at an unprecendented rate.]