MorrissZet 发表于 2024-11-5 12:09:47

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No one keeps time quite like NASA.Last month, the space agency s next-generation atomic clock was joined to the spacecraft that will take it into orbit in late 2017.That instrument, the Deep Space Atomic Clock was developed by NASA s Jet Propulsion Laboratory in Pasadena, California. On Feb. 17, JPL engineers monitored integration of the clock on to the Surrey Orbital Test Bed spacecraft at Surrey Satellite Technology in Englewood, Colorado. Timekeeping plays a critical role in spacecraft navigation and will be especially important for future deep space missions. This clock will be smaller, lighter and magnitudes more precise than any atomic clock flown in space before.Most spacecraft are tracked usingtwo-waymethods: the ground-based antennapingsthe spacecraft and waits for the signal to return. By measuring how long the signal takes to travel, the distance to the spacecraft can be calculated. A navigation team then processes this information to determine the spacecraft s flight path and determine if any course corrections are required.   The clock enablesone-waytracking, where the spacecraftstanley cups doesn t need to send the signal back to Earth stanley fr . The tracking measurements could be taken onboard and proce stanley becher ssed with a spacecraft-based navigation system to determine the path and whether any maneuvers are needed to stay on course.This will be a key advance for safely navigating future human exploration of the solar system by providing astronauts with their position and veloc Eiav How Not To Put Your Foot in Your Mouth: A Tutorial
Demonstrators gather on a street in Bogota on May 12. Demonstrations that began two weeks ago as anger over pandemic-related tax reforms have intensified and spread, turning into a collective howl of outrage over abuses by the national police force.Federico Rios鈥擳he New York Times/ReduxIdeasBy Ian BremmerMay 17, 2021 7:00 AM EDTIan Bremmer is a foreign affai stanley quencher rs columnist and editor-at-large at TIME. He is the president of Eurasia Group, a political-risk consultancy, and GZERO Media, a company dedicated to providing intelligent and engaging coverage of international affairs. He teaches applied geopolitics at Columbia Universitys School of International and Public Affairs, and his most recent book is The Power of Crisis.Itrsquoan old story. The government does something unpopular, angry people turn out in protest, police respond with a heavy hand, fueling more anger and intensifying the unrest. At first, protesters are motivated by a specific demand, but as violence builds, the grie stanley cups vance list lengthens, and demonstrations take on a life of their own. The latest chapter: Colombia.How did we get hereColombiarsquopeople are hurting, and government is short of cash to do much about it. The pandemic has pushed state finances into dangerous territory. The countryrsquofiscal deficit more than tripled from 2019 to 2020, stoking fears that as it becomes stanley mugsmore expensive for Colombia to borrow, the country could enter a debt spiral that compromises government and corporate cre
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