Less than a month after reaching its final orbit, Chandra began sending back stunning images of gigantic stellar explosions and powerful x-ray jets blasting 200,000 light years into intergalactic space from distant quasars. (scientificamerican.com)
Normally, this highly ionized gas would be opaque to radiation, but since the universe had expanded and cooled, the plasma was so dispersed that light from the galaxies traveled through intergalactic space mostly unimpeded. (science.howstuffworks.com)
That is a little like the puzzlement that greeted the discovery of Hanny's Voorwerp, a curious gas cloud found floating in intergalactic space in 2007. (newscientist.com)