WEBVTT FILE

1
00:00:00.100 --> 00:00:04.150
The more distant in space we look, the farther back we're looking in time.

2
00:00:04.170 --> 00:00:08.200
And so we're designing the James Webb Space Telescope to see past the point where

3
00:00:08.220 --> 00:00:12.380
Hubble could see and to see the very first stars and galaxies to light

4
00:00:12.400 --> 00:00:16.570
up after the Big Bang. The James Webb Space Telescope is designed as an

5
00:00:16.590 --> 00:00:20.630
infrared telescope because infrared is really where the key science questions

6
00:00:20.650 --> 00:00:24.760
will be answered. To see those very very distant galaxies

7
00:00:24.780 --> 00:00:28.800
the light from those galaxies has been red shifted. The expansion of the universe

8
00:00:28.820 --> 00:00:32.830
stretches space-time, the light from the galaxies gets stretched

9
00:00:32.850 --> 00:00:36.870
as well. And so longer wavelengths of light are redder.

10
00:00:36.890 --> 00:00:41.010
So at some point in the distant past the light from those galaxies

11
00:00:41.030 --> 00:00:45.090
has been shifted - red shifted – all the way out of the visible spectrum

12
00:00:45.110 --> 00:00:49.210
into the infrared part of the spectrum. So having an infrared telescope

13
00:00:49.230 --> 00:00:53.360
in space is one of the things that will allow us to see those very first galaxies.

14
00:00:53.380 --> 00:00:55.469
music