In this section of the Local Group of galaxies, Andromeda is the largest spiral near the centre of the picture and Triangulum is the smaller spiral nearest the bottom. A hydrogen bridge has been confirmed to stretch between them (Artist’s impression: Mark Garlick/Science Photo Library)
IT’S a bridge like no other. The intergalactic void between the Andromeda and Triangulum galaxies is spanned by a 782,000-light-year-long hydrogen link. The vast “bridge” looks like the strongest evidence yet of the elusive final third of the universe’s normal matter, which has so far escaped direct detection.
Computer simulations of how the universe…
