Astronomers believe they have discovered some of the oldest galaxies in the universe. Researchers in England say the clusters of stars are about 13,000,000,000 years old and were formed about 100,000,000 years after the Big Bang. Authors of a new study call the find "hugely exciting." They note the galaxies are in orbit around the Milky Way virtually in our own backyard. The study appears in the latest edition of the Astrophysics Journal.