Featured series 
Tag: extrasolar planet
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Nation & World
How Earth was watered
Evidence is mounting that Earth’s water arrived during formation, aboard meteorites and small bodies called “planetesimals.”
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Nation & World
Astronomically close
Earth-like planets potentially capable of supporting life may be right in our galactic neighborhood, according to researchers from the Harvard-Smithsonian Center for Astrophysics and the California Institute of Technology.
