Science: A Closer Look at the Big Bang

For astronomers, remote galaxies are cosmic Rosetta stones. Because their faint glimmers of light take billions of years to reach earth, these galaxies -- conglomerations of stars, dust, gas and, perhaps, planets -- offer a unique glimpse far back into time and provide clues to the age of the universe. As Physicist Stephen Hawking has observed: "When we look at the universe, we are seeing it as it was in the past." In those galactic outer reaches, too, lies hidden the answer to a tantalizing mystery: How soon after the cataclysmic fireball of the big bang, from which the universe presumably...