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Space Exploration

We Must Consider Benefits of Sending Life Outside of Solar System, Researchers Say

University of California, Santa Barbara’s professors Philip Lubin and Joel Rothman and their colleagues contemplate launching small cryptobiotic lifeforms into interstellar space. Our ability to explore the cosmos by direct contact has been limited to a small number of lunar and interplanetary missions. However, NASA’s Starlight program points a path forward to send small, relativistic spacecraft...

Genetics

Ancient Lions and Bears Colonized North America in Multiple Waves, DNA Study Says

Researchers from the University of Adelaide and elsewhere have sequenced and analyzed mitochondrial DNA from fossils of cave lions (Panthera spp.) and brown bears (Ursus arctos), two megafaunal carnivorans that dispersed from Eurasia into North America during the Pleistocene, to better understand the timing and drivers of their past movement between the continents across the Bering Land Bridge. Their...

Other Sciences

Ultralow-Velocity Zones are Leftovers from Early Earth’s Magma Ocean, New Study Suggests

Ultra-low velocity zones sit beneath the central Pacific and Africa, atop the outer core of Earth. In these areas, seismic waves slow by as much as half, and density goes up by a third. Geoscientists initially thought that these zones were areas where the mantle was partially melted, and might be the source of magma for hot spot volcanic regions like Iceland. New research suggests that it’s possible...