Scientists say they've uncovered the "largest known galactic structure," which spans a mind-boggling 1.4 billion light-years. That's more than 13,000 times the length of the Milky Way. The team led by scientists from the Max Planck Institute for Physics made the discovery after analyzing data as part of the ROSAT X-ray satellite sky survey. They found the structure, dubbed "Quipu," named after the strings with knots used by the Incas for bookkeeping, stretching across huge swathes of the night sky. The team believes it's largely composed of dark matter, the invisible substance that accounts for 85 percent of all mass […]

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