https://github.com/yurlungur/expanding-universe-animation

An animation that shows how, even though the universe is expanding, it has no center
https://github.com/yurlungur/expanding-universe-animation

Last synced: about 1 month ago
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An animation that shows how, even though the universe is expanding, it has no center

• Host: GitHub
• URL: https://github.com/yurlungur/expanding-universe-animation
• Owner: Yurlungur
• License: gpl-3.0
• Created: 2016-01-31T19:22:28.000Z (almost 9 years ago)
• Default Branch: master
• Last Pushed: 2016-01-31T23:02:06.000Z (almost 9 years ago)
• Last Synced: 2023-03-23T17:06:15.073Z (almost 2 years ago)
• Language: Python
• Size: 20.5 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Expanding Universe Animation

Author: Jonah Miller ([email protected])

Time-stamp: <2016-01-31 17:49:01 (jmiller)>

## Requirements

* python2 or python3, doesn't matter which.

  * Note that I had trouble

	saving the animation in python3 because of a

	[known bug in numpy](https://github.com/matplotlib/matplotlib/issues/1891/). For

	this reason, the code uses python2 by default.

* matplotlib

* numpy

* ffmpeg

## Description

This is python code to generate an animation showing how the universe

expands. In the left frame, I show how the expansion of the universe

looks to us. The Earth is a red dot and all astronomical objects are

moving away from it. Nearer objects appear to be moving away from the

Earth less quickly than distant objects. (That's

[Hubble's law](https://en.wikipedia.org/wiki/Hubble's_law).)

In the right frame, I show how the expansion of the universe looks in

a different (arbitrary) reference frame. Again the Earth is a red

dot. The overall distance between each point in space is increasing at

a constant rate. This is the expanding universe we know and love.

A key point is that in an expanding universe, every point looks like

the center of an explosion, but there is no center. And there is no

explosion.

## Running

To generate the animation, just clone the repository, enter it, and

type `make`. This will generate an mp4 video and a gif.

To swap between python2 and python3, edit the `PYTHON` variable in the Makefile.