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HumansPieces of Homo naledi story continue to puzzle
Researchers defend Homo naledi as a new hominid species and debate how it reached an underground cave.
By Bruce Bower -
CosmologyNew sky map charts previously unknown gamma-ray sources
A new map of the sky from the High-Altitude Water Cherenkov Observatory charts the cosmic origins of high-energy photons.
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Planetary ScienceHow alien can a planet be and still support life?
Geoscientists imagine the unearthly mechanisms that could keep alien planets habitable.
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AstronomyNew telescopes will search for signs of life on distant planets
Researchers are coming up with creative ways to pick up biosignatures in far-away planetary atmospheres.