Largest dataset of its kind could clarify how massive stars shaped early galaxies

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Add as preferred source Early stars are thought to have formed 100 million years after the big bang, when dense hydrogen and helium clouds collapsed under their own gravitational pull. Once the pressure and temperature was high enough, hydrogen atoms fused together, releasing energy in the form of light. Credit: NASA, STScI/A. Schaller The more astronomers learn about the universe's earliest galaxies, the stranger they seem. Many of their surprising properties may be explained by differences between their massive stars and those in galaxies like our own Milky Way. A new University of Utah-led survey with the Hubble Space Telescope is shedding light on the stellar astrophysics operating in early galaxies.