How Galaxies Live, Breathe and Die

Gas glows white, lit by a stellar nursery, in this view of a region within the Large Magellanic Cloud, the Milky Way’s largest satellite galaxy. Most cosmic gas is not so visible and lies outside of galaxies — in halos surrounding galaxies and in the vast spaces in between. Yet the gas determines galactic life cycles. (Credit: ESA/Hubble & NASA) Most of what astronomers know about the universe comes from what they can see. So their ideas have been prejudiced toward stars and galaxies,...

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