Michael J Fox, President Trump, Einstein discussed on Science Fantastic with Michio Kaku

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In the lab so we've detected the casimir vacuum and it has a negative energy density so it's a quantum effect and that's what he was relying on there's also a slight negative energy dance today effect around black hold at slowly causes the black hole to evaporate this is the hawking radiation so the heartland hocking vacuum around a black hole has a slight negative energy density so i think that these are not as far fetched as people might at i think now every once in a while someone says that they've been able to create a design for a time machine that they can put in their garage now given the fact that we're talking about black holes we're talking to vowed tiny amounts of energy from the casimir effect don't you think that it's a little bit premature for these basement inventors to announce that they've created a time machine in their in their basement yeah absolutely the more mold solution would weigh about two hundred million solar masses the loop of string that i was talking about this might be a fraction of the massive our galaxy so this is this is not something you're going to be making in your garage but we're we're interested in these the theoretical possibility for them because to realize whether these things may may be possible we may have to learn about the laws of quantum gravity and this is the topic of great interest so they're they're a great thought experiment to explore physics in the extreme and of course einstein was talking about face ships traveling near the speed of light and ended up with equals mc squared which is at practical consequences yes i think so so in other words i guess we should not expect any any amateur inventor to come up with a time machine in their basement many times soon but now let's talk about the paradox is you get if you build a time machine if you could go backwards in time like what michael j fox did and monkey around with the past don't you thereby change the present in fact changed the president in a way which is logically impossible like for example if you go backwards in time it commit suicide how could you be alive could you just committed suicide in.

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