1 00:00:00,100 --> 00:00:03,370 One month after launch, the James Webb Space Telescope ... 2 00:00:03,370 --> 00:00:05,405 arrived at its orbital destination. 3 00:00:05,405 --> 00:00:06,139 Music 4 00:00:06,139 --> 00:00:07,708 Webb will perform its science mission while orbiting ... 5 00:00:07,708 --> 00:00:11,979 a location in space, called the second Lagrange point, ... 6 00:00:11,979 --> 00:00:13,847 or L2 for short ... 7 00:00:13,847 --> 00:00:14,848 Music 8 00:00:14,848 --> 00:00:19,386 It is located one million miles from Earth. 9 00:00:19,386 --> 00:00:20,554 Music 10 00:00:20,554 --> 00:00:24,691 As Webb orbits L2, the telescope stays in line with Earth ... 11 00:00:24,691 --> 00:00:26,894 as it travels around the Sun. 12 00:00:26,894 --> 00:00:28,061 Music 13 00:00:28,061 --> 00:00:33,000 L2 is a point where the gravitational influences of ... 14 00:00:33,000 --> 00:00:36,637 the Earth and Sun balance the centripetal force of a ... 15 00:00:36,637 --> 00:00:40,207 small object orbiting with them. 16 00:00:40,207 --> 00:00:41,108 Music 17 00:00:41,108 --> 00:00:44,444 The telescope's optics and instruments need to be kept ... 18 00:00:44,444 --> 00:00:46,747 very cold to be able to observe the very faint infrared ... 19 00:00:46,747 --> 00:00:48,282 signals of very distant objects clearly. 20 00:00:48,282 --> 00:00:49,149 Music 21 00:00:49,149 --> 00:00:53,320 This location is perfect for Webb's sunshield to ... 22 00:00:53,320 --> 00:00:55,756 block out light and heat from the Sun, Earth and Moon. 23 00:00:55,756 --> 00:00:57,024 Music 24 00:00:57,024 --> 00:00:59,626 Unlike the Hubble Space Telescope, Webb's orbit ... 25 00:00:59,626 --> 00:01:05,399 keeps the spacecraft out of Earth's shadow ... 26 00:01:05,399 --> 00:01:06,600 Music 27 00:01:06,600 --> 00:01:09,036 making L2 a thermally stable location for the observatory ... 28 00:01:09,036 --> 00:01:10,003 to operate at. 29 00:01:10,003 --> 00:01:10,637 Music 30 00:01:10,637 --> 00:01:15,008 Webb will operate within its field of regard. 31 00:01:15,008 --> 00:01:16,710 Music 32 00:01:16,710 --> 00:01:21,648 The "field of regard" refers to the angles the telescope ... 33 00:01:21,648 --> 00:01:25,519 can move while staying in the shadow of the Sun. 34 00:01:25,519 --> 00:01:26,586 Music 35 00:01:26,586 --> 00:01:28,956 Each of Webb's instruments has its own field of view. ... 36 00:01:28,956 --> 00:01:34,261 The field of view is the area of sky an instrument can observe. 37 00:01:34,261 --> 00:01:35,295 Music 38 00:01:35,295 --> 00:01:37,531 While Webb is orbiting, it's fine steering mirror keeps ... 39 00:01:37,531 --> 00:01:37,531 40 00:01:37,531 --> 00:01:37,531 41 00:01:37,531 --> 00:01:40,567 images stable while it is pointing at a target. 42 00:01:40,567 --> 00:01:41,134 Music 43 00:01:41,134 --> 00:01:43,070 The commissioning process will be complete approximately ... 44 00:01:43,070 --> 00:01:45,038 six months after launch, at which time Webb will ... 45 00:01:45,038 --> 00:01:46,573 start its science mission ... 46 00:01:46,573 --> 00:01:47,074 Music 47 00:01:47,074 --> 00:01:52,779 Helping to uncover more of the mysteries of out Universe. 48 00:01:52,779 --> 00:02:02,779 Music