By Pierre Celerier Astronomers have discovered the first “bubble of galaxies,” an almost unimaginably huge cosmic structure thought to be a fossilised remnant from just after the Big Bang sitting in our galactic backyard. The bubble spans a billion light years, making it 10,000 times wider than the Milky Way galaxy. Yet this giant bubble, which cannot be seen by the naked eye, is a relatively close 820 million light years away from our home […]