Science: Great Bubbles in the Cosmos

A celestial map reveals clues to the Big Bang and invisible matter

For all their skill at finding and analyzing such bizarre objects as black holes, neutron stars and quasars, astronomers have so far failed to solve one of the most basic mysteries of the cosmos: What does the universe look like? The heavens appear just as two dimensional through powerful modern telescopes as they did to the eyes of the ancient Greeks, and until recently, no one could say for sure whether the myriad galaxies were organized in some meaningful way. Astrophysicists are fiercely competing to discover how the universe evolved into its present structure, but they cannot test their theories until...

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