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from Mail Online

Mysterious 'dark matter' is mapped at last - a 'cosmic web' spanning a billion light years

found a 'web' of dark matter stretching through space, interwoven with the galaxies we can see from Earth. Dark matter has frequently been...

from WIRED

Has Our Galaxy’s Dark Matter Gone Missing?

This is a picture of stars outside the galaxtic plane. This was taken in the visible light spectrum. The photo was taken by NASA. If we were to traverse the Milky Way it would take a very long time, the diameter is about 100,000 light years in diameter.