Relativity, Black Holes, Time Travel

The Ultimate Guide to Black Holes
https://www.youtube.com/watch?v=Z3U0vjSUhOA

Into The Universe With Stephen Hawking – Time Travel
https://www.youtube.com/watch?v=_iby0vsD9C4

Quantum Theory – Full Documentary
https://www.youtube.com/watch?v=CBrsWPCp_rs

 

Documentary National Geographic 2014 Monster Black Holes Full Documentary HD
https://www.youtube.com/watch?v=Niurc_6xIYg
Why don’t black holes explode once they lose enough mass?
“So what actually happens is that a black hole never stops being a black hole. Once you’ve formed a black hole, that object is going to stay a black hole. But Hawking radiation does slowly eat away at the mass in a black hole and in fact, the prediction is that a black hole should radiate faster and faster as it becomes smaller and smaller. So, right at the end, as a black hole becomes tinier and tinier, we do expect that to be sort of energetic pop at the very end of its life as the black hole shrinks away to nothing and emits a final burst of very intense radiation. So, there is sort of a bit of an explosion right at the end, but that’s not because it’s reached a minimum mass. It’s just because it’s radiating away energy faster and faster.”
http://www.thenakedscientists.com/HTML/questions/qotw/question/3183/