Black Hole
May contain traces of nut
If anybody's looking for 4K content (or even if you don't have 4K), try this:
I haven't tried it on my UHD computer monitor yet, it means firing up Zen (which isn't very happy at the moment, possibly because I've been moonlighting its monitor on my notebook - which only goes up to 1920x1080).That looked spectacular on my phone, which subtended a bigger solid angle to my eyes than the TV across the room.
youtube -f "313+251" https://www.youtube.com/watch?v=ZTZPOAdxJao
youtube -f "313+251" https://www.youtube.com/watch?v=4AtJV7U3DlU
youtube-dl -f "313+251" https://www.youtube.com/watch?v=ZTZPOAdxJao
youtube-dl -f "313+251" https://www.youtube.com/watch?v=4AtJV7U3DlU