Metal-rich Stars Host Closer Planets

Iron-rich stars host planets on closer orbits than their iron-poor siblings, astronomers find. The results could help reveal how planets form. The more iron a star contains, the closer its planet’s orbit. And astronomers aren’t quite sure why. Robert Wilson, a graduate student at the University of Virginia, announced the puzzling result at a meeting of the American Astronomical Society in Washington, D.C. Stars are mostly hydrogen and helium, with […]

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