WEBVTT FILE

1
00:00:01.070 --> 00:00:05.070
music

2
00:00:05.070 --> 00:00:12.000
Technicians successfully test James Webb Space Telescope’s Deployable Tower Assembly.

3
00:00:12.000 --> 00:00:16.000
This tower creates a 4-foot (1.2 meter) gap between Webb’s mirror and science segment and it’s sunshield and spacecraft bus segment.

4
00:00:16.000 --> 00:00:23.000
This gap allows Webb’s active and passive cooling systems to cool its mirrors and sensors down to super cold temperatures.

5
00:00:23.000 --> 00:00:32.710
Mirrors and instruments need to be super cold for Webb to perform its science.

6
00:00:32.710 --> 00:00:37.000
A special pulley and counterbalance system perfectly offset the weight of Webb’s mirrors and instrument segment

7
00:00:37.000 --> 00:00:44.000
Canceling the effects of Earth’s gravity for this test.  The tower slowly extended upward over the course of several hours.

8
00:00:44.000 --> 00:00:51.720
This is the same maneuver it will perform once in space.  NASA’s James Webb Space Telescope will be the world’s premier space science observatory when it launches.

9
00:00:51.720 --> 00:00:58.000
Webb is an international program led by NASA with its partners, the European Space Agency and the Canadian Space Agency.

10
00:00:58.000 --> 00:01:00.075
music