HOUSTON – NASA’s exceptionally long-lived Voyager 1 and 2 spacecraft have notched another achievement in their long journey through the far reaches of the Solar System: the first detection of a telltale ultraviolet emission coming from the Milky Way galaxy. The Lyman-alpha radiation coming from abundant atomic hydrogen in galaxies is an indicator of star formation rates, the ionization environment in which the atmospheres of young planets evolve and the quantities of shocked gas in the ...


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