Open Day 2009, /movies/jf334

	Parent Directory		-
	all2.avi	19-Mar-2009 15:03	1.8M
	dbi.avi	19-Mar-2009 15:03	4.8M
	equi.avi	19-Mar-2009 15:03	4.7M
	local.avi	19-Mar-2009 15:03	4.8M
	single.avi	19-Mar-2009 15:03	4.7M
	warm.avi	19-Mar-2009 15:03	4.9M

The movie all2 which is a amalgamation of all the models:

When we look at the sky, as light takes time to travel to us, we are looking back in time. The oldest thing we can see is a wall of light, a result of the big bang that created the universe, from the time when the universe became transparent.

Before this time the universe was so hot that the light couldn't travel far without interacting with free particles, and as a result, was opaque. As the universe expanded it cooled the particles bound together and the light was free to travel until today.

This wall of light is the oldest thing we can see and so provides the earliest data we can currently obtain. This wall of light is largely uniform, but there are some small variations in its temperature from tiny density changes in the matter. These variations are the seeds from which the galaxies we see today grew.

We can measure these tiny variations use their properties to infer what the universe must have been like at the very beginning of time. One measurement we can make is to see how well the temperature variations fit a standard bell curve, or normal distribution.

The movie we see here represents six theoretical predictions for a three dimensional measure of how the fluctuations deviate from a standard bell curve, for different models of how the universe began.