Science Colossal hydrogen bridge between galaxies could be fuel line for new stars

Researchers studying a filament of hydrogen between the Andromeda and Triangulum galaxies found rotating clumps of gas the size of dwarf galaxies. But questions remain.


Bill Saxton, NRAO/AUI/NSF

Newly published radiotelescope observations of this segment of what researchers have dubbed the “cosmic web” reveal that about half of the neutral hydrogen gas in the bridge is contained in rotating clumps the size of dwarf galaxies. Neutral hydrogen – atoms with one proton and one electron – represents the raw material for new stars.