1 00:00:08,150 --> 00:00:06,389 when orion gets near the moon lunar 2 00:00:11,110 --> 00:00:08,160 gravity will pull the spacecraft to 3 00:00:13,190 --> 00:00:11,120 about 60 miles above the moon's surface 4 00:00:15,430 --> 00:00:13,200 mission controllers precisely fire the 5 00:00:17,910 --> 00:00:15,440 service module's engines aiming for the 6 00:00:20,630 --> 00:00:17,920 exact altitude or height of a distant 7 00:00:22,950 --> 00:00:20,640 retrograde orbit orion travels for five 8 00:00:24,790 --> 00:00:22,960 days to meet the orbit forty thousand 9 00:00:27,029 --> 00:00:24,800 miles beyond the moon 10 00:00:28,790 --> 00:00:27,039 once at just the right height a second 11 00:00:31,830 --> 00:00:28,800 burn of the service module engines 12 00:00:33,510 --> 00:00:31,840 steadies orion into dro the orbit is 13 00:00:35,430 --> 00:00:33,520 called distant because orion will be 14 00:00:36,790 --> 00:00:35,440 orbiting very high above the moon's 15 00:00:38,950 --> 00:00:36,800 surface 16 00:00:40,069 --> 00:00:38,960 retrograde is just a fancy word for 17 00:00:42,150 --> 00:00:40,079 opposite 18 00:00:43,270 --> 00:00:42,160 the moon travels around the earth in one 19 00:00:44,950 --> 00:00:43,280 direction 20 00:00:46,790 --> 00:00:44,960 orion will go around the moon in the 21 00:00:49,190 --> 00:00:46,800 opposite direction 22 00:00:51,510 --> 00:00:49,200 dro is a stable orbit that's easy for 23 00:00:53,910 --> 00:00:51,520 orion to remain in 24 00:00:56,470 --> 00:00:53,920 once in the orbit orion will travel for