Whether he meant to or not, Steven Spielberg has been trying to convince the world of alien existence for over 40 years. He’s donated money to research programs. He’s discussed the issue with ...
A version of this story appears in the February 2017 issue of National Geographic magazine. Citrus, in many ways, stands alone. So many cultivated species have come from so few primary ancestors. Just ...
A new exoplanet model screens rocky worlds by their ability to retain atmospheres over geologic timescales, helping narrow the search for potentially habitable planets beyond Earth.
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