The Milky Way's core doesn't look like the ancient stellar graveyard many astronomers once thought it was. At the heart of a massive new survey from NASA 's Hubble Space Telescope, astronomers are mapping one of the most crowded regions in our galaxy. Early results from the project may help address a long-running debate about the age of the Milky Way's central bulge — the tightly packed region of space surrounding the galaxy's core . For decades, many astronomers treated the bulge as a relic from the Milky Way's earliest years. Previous studies of star brightness and color placed most of its formation around 10 billion years ago. By comparison, our solar system formed just 4.6 billion years ago. But newer research has complicated that picture. Some studies suggest a noticeable share of stars near the galactic center may be much younger — perhaps only 5 billion to 8 billion years old. If true, that would mean the Milky Way kept developing its central region far later than some scientists had ever imagined.…