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[AnonymBruker]

Astronomers have discovered the largest known structure in the universe, a clump of active galactic cores that stretch 4 billion light-years from end to end. The structure is a light quasar group (LQG), a collection of extremely luminous Galactic Nulcei powered by supermassive central black holes.

Hvordan vet de/måler de lysår?

http://wasbella102.tumblr.com/post/61133311026/astronomers-have-discovered-the-largest-known

Anonymous poster hash: 1cdc8...8c7

[Lutetium 71]

http://en.wikipedia.org/wiki/Speed_of_light#Measurement