A light year would be an inappropriate unit of measurement in these circumstances. Earth has a diameter of approximately 12,700km. The distance from Earth to the Moon is approximately 384,400km.

Scientists say they've uncovered the "largest known galactic structure," which spans a mind-boggling 1.4 billion light-years.

Scientists say they've uncovered the "largest known galactic structure" — a cosmic monster that spans a mind-boggling 1.4 billion light-years, which is around 14,000 times the diameter of our ...