This is an incredible piece of work by youtube user melodysheep.
Here are the notes that were posted with the video:
My own musical tribute to two great men of science. Carl Sagan and his cosmologist companion Stephen Hawking present: A Glorious Dawn – Cosmos remixed. Almost all samples and footage taken from Carl Sagan’s Cosmos and Stephen Hawking’s Universe series.
RIP Dr. Sagan, you will be missed!!
Please, click HQ to watch in better quality.
Go here to download the track:
And here for another scientist remix:
And my website for more original music: