| 单词 | free return |
| 释义 | > as lemmasfree return free return n. Astronautics a return flight of a spacecraft accomplished without significant expenditure of fuel through making use of planetary gravitation; usually attributive. ΘΚΠ society > travel > air or space travel > space flight > [noun] > a space shot or flight > course or trajectory of spacecraft > positioning on return path using gravitation free return1963 1963 A. J. Schwaniger Trajectories in Earth-Moon Space (NASA Techn. Note D–1833) 2 When the manned mission is to land on the moon's surface, a ‘free return’ trajectory may be used so that if unforeseen difficulties arise..the astronauts will return safely to the earth. 1970 Times 15 Apr. 10/2 As the vehicle travelled round to the back of the moon, the effect of the lunar gravitation field was such as to swing the ship round on to a homeward trajectory. This is what the flight dynamics specialists call a free return trajectory. 2006 Analog June 26/2 If we can't send messages to the Mars station, we won't even be able to navigate a free return trajectory. < as lemmas |
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