Word: star
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According to Simon, previous methods of detecting metal-poor stars proved less useful the more metal-poor the star...
...we’re in middle age now, this star was born when the universe was basically a toddler,” said Evan N. Kirby, a researcher at California Institute of Technology and one of the authors...
Astronomers can determine how long ago a star was created by measuring its metal content because stars that contain more elements beyond hydrogen and helium are newer than “metal-poor” stars like the one found in the Sculptor Galaxy...
...roughly 13.7 billion year old universe, Frebel said she estimated that the star in Sculptor was 12 to 13 billion years...
Using the Keck Telescope in Hawaii, Kirby set out to find evidence of metal-poor stars in dwarf galaxies by scanning the skies using medium-resolution spectroscopy, which allowed him to study many stars but didn’t yield a detail-rich characterization of any one star...