Horizon: How Big is the Universe

00:00:02 The most ambitious map in history

00:02:46 Other times, you only get, you know, 10% of the night.

00:05:50 and it's one of my favourite landmarks to help me orient myself.

00:08:55 about the observable universe.

00:11:14 You really have to try to imagine

00:13:11 The map of the observable universe doesn't change

00:15:56 it's kind of a good feeling.

00:18:25 The first time round, they didn't measure any red shifts.

00:20:54 Every point of light on the map is a galaxy like the Milky Way.

00:23:44 There's obviously some interesting stories going on down there

00:26:24 The idea of General Relativity bending space and time

00:28:42 beneath the surface of the cosmic ocean.

00:31:36 to map the deceleration of the universe.

00:34:06 He would find his way by the light of a dying star.

00:36:28 They took snapshots of thousands of galaxies at once

00:39:04 and everyone's on board -

00:41:13 You don't see it doing anything, directly.

00:42:59 When the universe doubles in size

00:45:28 We know we could step far from the Earth, as an astronaut has.

00:47:45 and light itself will travel in an arc if the space is curved.

00:50:27 so between us and the size of a feature in the CMB

00:52:35 between every point in this infinite universe.

00:55:17 It's a process called eternal inflation.

30:00:00 placed on the map of the universe.