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Δ-DOR navigation has been used by number of NASA planetary missions. Other space agencies have also used the technique, on missions such as: ESA used a Δ-DOR system for Venus Express' orbit insertion in April 2006 and to Rosetta's Mars swingby in February 2007. The technique was also used in guiding the ExoMars Trace Gas Orbiter during its ...
Relativistic rocket means any spacecraft that travels close enough to light speed for relativistic effects to become significant. The meaning of "significant" is a matter of context, but often a threshold velocity of 30% to 50% of the speed of light (0.3 c to 0.5 c) is used. At 30% c, the difference between relativistic mass and rest mass is ...
List of Delta Air Lines destinations. Delta Air Lines is a major United States airline based in Atlanta, Georgia. As of December 31, 2021, Delta's mainline aircraft fly to 242 destinations, serving 52 countries across six continents. The airline operates nine domestic hubs. [1]
The Yukon–Kuskokwim Delta is a river delta located where the Yukon and Kuskokwim rivers empty into the Bering Sea on the west coast of the U.S. state of Alaska. At approximately 129,500 square kilometers (50,000 sq mi) in size, [1] it is one of the largest deltas in the world. [2] [3] It is larger than the Mississippi River Delta (which ...
Environmental impacts. The sharp and lasting decline in planned air travel throughout the pandemic had a beneficial effect of global climate change. [149] The effects of COVID-19 lockdowns were subject of the first quantitative research on large-scale modal shifts and demand reduction in aviation. [150]
Website. c-tran.com. An older type of C-Tran bus (a 1982 General Motors RTS, a type now retired from the agency's fleet) at the Parkrose-Sumner Transit Center in Portland. A C-Tran Gillig Phantom in a later paint scheme. The agency still operates high-floor buses of this type, but has been gradually replacing them with low-floor models.
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