Dec. 20, 2017, 8:38 p.m.

NASA Astronauts on Third and Final Spacewalk in October Series

NASA astronauts Joe Acaba (left) and Randy Bresnik (right) at work outside the International Space Station on Oct. 20, 2017, in the third of a series of three planned spacewalks. The two astronauts successfully completed the 6 hour, 49 minute spacewalk at 2:36 p.m. EDT.

Expedition 53 Embarks upon Third and Final Spacewalk in October Series

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The Fault in Our Mars

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This image from NASA's Mars Reconnaissance Orbiter (MRO) of northern Meridiani Planum shows faults that have disrupted layered deposits.

The Fault in Our Mars

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Researchers have resolved one of the great unknowns in bone self-repair: how the cells responsible for forming new bone tissue are called into action. Their work reveals the role of an electromechanical phenomenon at the nanoscale, flexoelectricity, as a possible mechanism for stimulating the cell response and guiding it throughout the fracture repair process.https://www.sciencedaily.com/releases/2018/01/180120122710.htm

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